# Book 1: Chapter No 4 Work and Energy

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## Book 1: Chapter No 4

Work and Energy

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Question 1 |

A body moves a distance of 111m along a straight line under the action of force of 5N and work done is 25J. The angle whichthe force makes with the direction of motion will be

A | 60° |

B | 30° |

C | 70° |

D | 90° |

Question 2 |

When a body is moved or stopped through a certain displacement 'd' by a force F', then the work done is

A | F . d |

B | F - d |

C | F + d |

D | F x d |

Question 3 |

The work done will be zero when the angle between force F and the displacement d is

A | 45° |

B | 100° |

C | 80° |

D | 90° |

Question 4 |

The work done will be negative if the angle between force F and displacement d is

A | 30° |

B | 60° |

C | 90° |

D | 180° |

Question 5 |

The SI unit of work is

A | Joule |

B | Newton |

C | Erg |

D | Dyne |

Question 6 |

The dimensions of work are

A | MLT-1 |

B | ML2T-2 |

C | MIT2 |

D | MLT |

Question 7 |

If force and displacement arc in the 'opposite direction, the work done is taken as

A | Positive work |

B | Negative work |

C | Finite work |

D | Infinite work |

Question 8 |

If a force of one Newton acts on a body and displaces. it through a distance of one meter in the direction of force then the work done will be

A | I Dyne |

B | 1 Watt |

C | 1 |

D | 1 Joule |

Question 9 |

When the force is parallel to the direction of motion of the body, then work done on the body is

A | Zero |

B | Centripetal force |

C | Infinity |

D | maximum |

Question 10 |

if the direction of motion of force is perpendicular to the direction of the motion of the body, then work done will be

A | Minimum |

B | Maximum |

C | Zero |

D | Infinity |

Question 11 |

Which of the following types of force can do no work on the particle on which it acts?

A | Frictional force |

B | Gravitational force |

C | Elastic force |

D | Centripetal force |

Question 12 |

If a body of mass of 2kg is raised vertically through 2m, then the work done will be

A | 38.2 J |

B | 392.1 J |

C | 39.2 J |

D | 40 J |

Question 13 |

A body of mass 2kg is lifted to the first floor at a height of 10m. What is the work done in joules?

A | 194 |

B | 198 |

C | 196 |

D | 200 |

Question 14 |

Tile important source of energy other than the sun is

A | electrical energy |

B | heat energy |

C | nuclear energy |

D | wind energy |

Question 15 |

Tile important source of energy other than the sun is

A | electrical energy |

B | heat energy |

C | nuclear energy |

D | wind energy |

Question 16 |

A field in which the work done in moving a body along a closed path is zero is called

A | Electric field |

B | Nuclear field |

C | Conservative field |

D | Gravitational field |

Question 17 |

If a body of weight OW' is lifted through a height 'h' then the work done will be

A | -wh |

B | zero |

C | wh |

D | sin? |

Question 18 |

Kilowatt hour is the unit of

A | Power |

B | Work |

C | Force |

D | Momentum |

Question 19 |

18. A force of 8N acting on a body of mass 5kg displaces it through 2m along its direction. The work done is

A | Zero |

B | 8J |

C | 16 J |

D | 24J |

Question 20 |

One mega watt-hour is equal to

A | 3p x 106J |

B | 36 X 1012 J |

C | 36 X 109J |

D | 36 X 108J |

Question 21 |

Work has the dimensions as that of .

A | Torque |

B | Angular momentum |

C | Linear momentum |

D | Power |

Question 22 |

Scalar product .of force and displacement is called

A | Power |

B | Watt |

C | Work |

D | Momentum. |

Question 23 |

The work done by the machine is called

A | Input |

B | Output |

C | Force |

D | Efficiency |

Question 24 |

A box of HI kg is moved 2m along' the' ground by a force of 211N making an angle of 60° with the horizontal. The net work done is

A | 300 Joules |

B | 200 Joules |

C | 100 Joules |

D | 20 Joules |

Question 25 |

If a force acting on a body produces a displacement in the direction of the force, what would be the product of force and. displacement

A | Work |

B | Power |

C | K,E |

D | PE |

Question 26 |

The work done by displacement d is

A | F /d |

B | F x d |

C | d / F |

D | F. d |

Question 27 |

The work done by a force ,acting on a body is maximum when

A | The displacement is 7.ero |

B | The force is parallel to the displacement |

C | The force is perpendicular to the displacement |

D | The force is anti parallel to the displacement |

Question 28 |

work done will be maximum if the angle between the force F and displacement d is

A | 45° |

B | 90° |

C | 180° |

D | 0° |

Question 29 |

The work done by a Force keeping an object in circular motion with constant speed, in joule is

A | 0 |

B | 1 |

C | 2 |

D | 3 |

Question 30 |

work is always done on a body if

A | lis displacement t is zero |

B | Its energy lS constant |

C | Magnitude of force is constant' |

D | Its energy increases |

Question 31 |

The unit of work in SJ system of units is

A | Foot-pound |

B | Joule |

C | Walt |

D | Erg |

Question 32 |

The work done in moving a body between two points in it conservative field is independent if

A | Force |

B | Direction |

C | Path followed by a body |

D | energy |

Question 33 |

Power is also defined as the dot product of

A | Force and mass |

B | Force and displacement |

C | Force and velocity |

D | Force and time |

Question 34 |

The SI unit of power is

A | Joule |

B | Walt |

C | Newton |

D | Dyne |

Question 35 |

The dimensions of power are

A | ML-1T2 |

B | ML2T2 |

C | ML2T3 |

D | ML2T-3 |

Question 36 |

The average power and instantaneous power become equal if work is done

A | At any rate |

B | At variable rate |

C | At uniform rate |

D | At high rate |

Question 37 |

The unit of power in British Engineering system

A | Horse power |

B | Watt |

C | KiloWatt |

D | Joule |

Question 38 |

The relation between horse power and watt is

A | I hp = 546 watts |

B | I hp = 746 watts |

C | I hp = 1000 watts- |

D | I hp = 946 watts- |

Question 39 |

If an athlete uses 500 Joules of energy to lift a load in 2 seconds, his muscular power is

A | 125 watt |

B | 250 watt |

C | 175 watt |

D | 205 watt |

Question 40 |

Which of the following units is different from other

A | Volt |

B | Watt-hour |

C | Walt-sec |

D | Electron volt |

Question 41 |

British Engineering system of units, one horse power is equal to

A | 742 watts |

B | 746 watts |

C | 749 watts |

D | 750 watts |

Question 42 |

What is the correct definition of power?

A | Doing work |

B | The rate of doing work |

C | Amount of work |

D | Change in energy |

Question 43 |

The unit of power in MKS system of units is

A | Walt |

B | Joule |

C | Erg |

D | Electron volt |

Question 44 |

If a force F moves a body with velocity V then power is

A | F. V |

B | Fx V |

C | F+ V |

D | F- V |

Question 45 |

The ability of a body to do work is known as its

A | Power |

B | Momentum |

C | Force |

D | Energy |

Question 46 |

The energy possessed by a body due to its motion is called'

A | Electric energy |

B | Potential energy |

C | Kinetic energy |

D | Nuclear energy |

Question 47 |

Kinetic energy is a

A | Y Scalar quantity |

B | Vector quantity |

C | Conservative quantity |

D | Fundamental quantity |

Question 48 |

A stone is thrown up from the surface of e:1I1h when it reaches at maximum height, it KE, is equal to

A | mgh |

B | 1/2 mv |

C | zero |

D | maximum |

Question 49 |

The energy that a body possess by virtue of position is called

A | Kinetic energy |

B | Potential energy |

C | Absolute potential energy |

D | None of the above |

Question 50 |

The unit of energy in SI system is

A | Joule |

B | Erg |

C | Foot pound |

D | None of the above |

Question 51 |

When the mass and .speed of a body are doubled the K. E becomes

A | 3 times |

B | 16 times |

C | 6times |

D | 8times |

Question 52 |

One erg is equal to

A | 10 Joule |

B | 10-5 Joule |

C | 10- 7Joule |

D | 10-3Joule |

Question 53 |

Kinetic energy of a body of mass m and velocity V is a

A | Vector as it contains V |

B | Scalar as it contains m |

C | Scalar as it can be written as 1/2m(v. v) |

D | Vector as it can be written as 1/2 m(v x v) |

Question 54 |

The energy possessed by a body due to change in its position IS' called

A | Kinetic energy. |

B | Elastic potential energy |

C | Potential energy |

D | Nuclear energy |

Question 55 |

Energy stored in the spring of watch is called

A | Potential energy |

B | Kinetic energy |

C | Elastic potential energy |

D | Nuclear energy |

Question 56 |

The dimensions of kinetic energy are

A | ML2T2 |

B | ML-2T2 |

C | ML1T2 |

D | ML2T3 |

Question 57 |

If velocity is doubled then

A | Momentum increases 4 times and K.E. increases 2 Limes |

B | Momentum and K.E.remain same |

C | Momentum increases 2 times and K.E. increases 3 times |

D | Momentum increases 2 times and K.E. increases -l times |

Question 58 |

When the speed of a moving body is doubled

A | Its K. E is doubled |

B | Its acceleration is doubled |

C | Its PE IS doubled |

D | Its momentum is. doubled |

Question 59 |

59. A body of mass 3kg lies on the surface of the table. 2m high. It. is moved on the surface by 4m. The change in P. E. will be

A | Zero |

B | 9.8 J |

C | 19.6 J |

D | 19.8 J |

Question 60 |

The consumption of energy by a 60 watt hulh in 2 sec is

A | 120 J |

B | 60 J |

C | 80 J |

D | 30 J |

Question 61 |

Which of the following is correct

A | Watt and Watt.-hour represent the same quantity. |

B | Watt represents energy and watt-hour represents force. |

C | Watt represents force and watt -hour represents energy. |

D | Watt represents power and watt -ham represents energy |

Question 62 |

A gas filled balloon possesses

A | Kinetic energy |

B | Energy |

C | Potential energy |

D | None of these |

Question 63 |

The energy possessed by a stretched string is

A | Electrostatic energy |

B | Elastic PE. |

C | Gravitational Potential |

D | Elasti K.E. |

Question 64 |

The K E required bya mass m after covering a fixed distance S from rest under a constant force is directly proportional to

A | m |

B | 2m |

C | 1m |

D | 1/2m |

Question 65 |

What is the P. E. lost by a man of mass 50 kg if he jumps from a 10m high building.

A | 3000 J |

B | 5000 J |

C | 4900 J |

D | 980 J |

Question 66 |

The energy possessed by a body by virtue of its motion is called

A | Heat energy |

B | Potential energy |

C | Kinetic energy |

D | Electrical energy |

Question 67 |

What is the KE of a particle of mass 0.0001kg moving with a speed of 3x106m/s

A | 4.5 x 10^9 j |

B | 4.5 x 10^3 j |

C | 65 x 10^4 j |

D | 5.5 x 10 j |

Question 68 |

What is the mathematical expression for the KE of a body of mass m moving with speed by? .

A | 2 mv2 |

B | mv2 |

C | 1/2 mv2 |

D | 3mv2 |

Question 69 |

work energy principle implies that the work done by the applied force is

A | Equal to change in K.E |

B | BY Greater than the change in K.E |

C | Less than the change in K.E |

D | Equal to P.E |

Question 70 |

When an arrow is released from its bow, its energy is transferred from

A | heat energy to K.E. |

B | elastic P.E. to K.E. |

C | chemical energy to elastic P.E. |

D | K.E. to elastic P.E. |

Question 71 |

Under which force energy is not conserved?

A | Frictional force |

B | Electrostatic force |

C | Gravitational force |

D | Magnetic force |

Question 72 |

The law of gravitation was introduced by

A | Huygen |

B | Boyle |

C | Newton |

D | Pascal |

Question 73 |

The value of G is

A | 66.7 X 10-11 N m2/kg2 |

B | 66.7 X 10-11 N m/kg2 |

C | 66.7 X 10-9 N m2/kg2 |

D | 0.06.7 X 10-11 N m2/kg2 |

Question 74 |

The acceleration due to gravity on a planet with mass and radius half that of earth will be

A | g |

B | g/2 |

C | 2 g |

D | g/4 |

Question 75 |

First of all G was measured in laboratory by .

A | Newton |

B | Airy |

C | Kepler |

D | Cavendish |

Question 76 |

At what depth below the earth's surface the value of g reduces to one half of its value at earth's surface

A | R/2 |

B | R |

C | 1/2R |

D | R/4 |

Question 77 |

The value of g at the centre. of the earth is

A | Zero |

B | 2g |

C | Infinite |

D | None of the above |

Question 78 |

The basic forces in nature are

A | 5 |

B | 3 |

C | 4 |

D | 2 |

Question 79 |

The gravitational force between two bodies is

A | Impulsive force |

B | Repulsive force |

C | Action and reaction force |

D | None of these |

Question 80 |

The value of gravitational constant 'G' was found by means of

A | Kepler's law |

B | Newton's laws of motion |

C | Newton' s law of gravitation |

D | Cavendish apparatus |

Question 81 |

In Sl units, the mass of the earth is

A | 8 x 10^24 kg |

B | 7x 10^24 kg |

C | 4 x 10^24 kg |

D | 6x 10^24 kg |

Question 82 |

The unit of 'G in SI units is

A | N2mKg2 |

B | N2mKg-2 |

C | N2mKg-2 |

D | N2mKg |

Question 83 |

The average mass per unit volume (or average density of the earth) is

A | 3 times the density of water |

B | 2 times the density of water |

C | 4times the density of water |

D | 5.5 times the density of water |

Question 84 |

The force of gravitation between two bodies 2mapart and each 'of 100 kg is

A | 16x N 10 |

B | 3.34x N |

C | 1.67 x 10-5 N |

D | 1.67 x 105 N |

Question 85 |

The value of g on the surface the earth is

A | 122ms-2 |

B | 10m s-2 |

C | 15 s-2 |

D | 9.8m s-2 |

Question 86 |

The weight of the body at the centre of the earth is

A | Slightly less |

B | Slightly greater |

C | Zero |

D | Infinite |

Question 87 |

The value of g is

A | Least at the equator |

B | Greatest at the equator |

C | Same all over the earth surface |

D | Least at the poles |

Question 88 |

The weight of a body is greater

A | On the poles |

B | On the equator |

C | At a place in between poles and equator |

D | At the centre of the earth |

Question 89 |

As we go below the surface of the earth, the value of g

A | Increases |

B | Decreases |

C | Remains constant |

D | Reduces to zero |

Question 90 |

At what depth below the earth surface, the value of 'g' reduces to one half of its value on the earth's surface

A | Re |

B | Re/2 |

C | 2Re |

D | Re/4 |

Question 91 |

The value of g is maximum

A | At the equator |

B | At the poles |

C | At the centre of the earth |

D | Between poles and equator |

Question 92 |

The value of g at a height e1lual to the radius of the earth •from its surface is

A | g' = g |

B | g' = g/2 |

C | g' = g/1 |

D | g' = g/4 |

Question 93 |

Pull of the earth on a mass of 20 kg on the surface of earth is

A | 20N |

B | 196N |

C | 19.6N |

D | 1960N |

Question 94 |

The value of 'g' at altitude 1,000000m is

A | 9.79-lms-2 |

B | 7.-41 ms-2 |

C | 9.60 ms-1 |

D | 9.60 ms-2 |

Question 95 |

The value of g is affected by earth's

A | Non-spherical shape |

B | Daily rotation |

C | Non-spherical shape and daily reaction |

D | None of these |

Question 96 |

Which one of the following is not a universal constant

A | Acceleration due to gravity g |

B | Electronic charge e |

C | Plank's constant h |

D | Gravitational constant G |

Question 97 |

A body is taken to a height equal to the radius of earth from its surface. The value of g becomes

A | gh = 1/2g |

B | gh = 1/4 |

C | gh = 1/4g |

D | gh = 1/3g |

Question 98 |

A tunnel is bored through the centre of the earth and a pebble is dropped, then it

A | Performs S.H.M. |

B | Sticks to the side of the bore |

C | Stops at the centre of the earth |

D | Drops to the other side |

Question 99 |

Which of the following does not affect g?

A | Depth of the place |

B | Longitude of the place |

C | Altitude of the place |

D | Latitude of the place |

Question 100 |

M1 LJ T-2 is the dimensional representation of

A | Force |

B | Power |

C | Gravitational constant |

D | Co-efficient of viscosity |

Question 101 |

the ratio of SI units to the C.G.s. units of constant of gravitation IS

A | 10-3 |

B | 10-1 |

C | 10-2 |

D | 10 |

Question 102 |

If G becomes four times, the 'g' will become

A | 4g |

B | 3g |

C | 2g |

D | 0g |

Question 103 |

If two masses 1 kg and 10 kg are 1 m apart, then acceleration of

A | Both masses is same |

B | 1 kg is greater than that of 10 kg : |

C | 10 kg is greater than that of 1 kg |

D | Both masses is zero |

Question 104 |

If gravitational force between two identical masses m, m be 6.67 x 10: 1 N when they are 1 m apart, then value of each mass will be

A | 2kg |

B | 1kg |

C | 3kg |

D | 5kg |

Question 105 |

If the distance between two masses each lkg is 1m, then force of attraction between the two will be

A | 9 x 10 N |

B | 6.7 x 10^-11N |

C | 9 x 109 N |

D | 6.7 x 10^12N |

Question 106 |

The acceleration due to gravity on a planet with mass and radius ¬half of the earth will be

A | 4.9 m/sec2 |

B | 19.6 m/sec2 |

C | 9.8 m/sec2 |

D | 9. m/sec2 |

Question 107 |

The energy stored in a dam is

A | heat energy |

B | potential eI1ergy |

C | kinetic energy |

D | nuclear energy |

Question 108 |

108. In In between earth and moon the weight of a .body becomes zero at a point where force of attraction due to

A | The moon is zero |

B | The earth is zero |

C | The moon and the earth is not equal |

D | Both the moon and the earth is equal and opposite• |

Question 109 |

Value of g at the surface of moon is

A | 6ge |

B | ge/6 |

C | 3ge |

D | 4ge |

Question 110 |

Value of g at the centre of earth is

A | Double |

B | Half |

C | 0 |

D | Infinite |

Question 111 |

Below the surface of earth, the value of g

A | Remains constant |

B | Decreases |

C | Increases |

D | At all points is zero |

Question 112 |

The value of gravitational constant G is found by means of

A | Torsion balance |

B | Cavendish apparatus |

C | Kepler's law |

D | Newton's laws of motion |

Question 113 |

Value of g will be greater at

A | Poles |

B | Equator |

C | The centre of earth |

D | Any point |

Question 114 |

At a distance equal to the radius of the earth above the surface of earth, the value of 'g' becomes

A | Half |

B | One fourth |

C | 0 |

D | Negative |

Question 115 |

If we go away from the surface of earth, the value of g will

A | Remain constant |

B | Increase |

C | Decrease |

D | None of these |

Question 116 |

Density of earth is greater than the density of water by

A | 6 times |

B | 5 times |

C | 5.5 times |

D | 4 times |

Question 117 |

The unit of G in Sf units is

A | Nm2/C2 |

B | Nm2/kg2 |

C | Nm/kg |

D | Nm2/kg |

Question 118 |

If distance between two bodies is doubled and their masses are also doubled the gravitational force will

A | Increase four times |

B | Decrease four times |

C | Remain constant |

D | None of them |

Question 119 |

If the distance between two bodies is doubled the gravitational force will

A | Remain same |

B | Become one fourth |

C | Become four times |

D | Increase four times |

Question 120 |

If the distance between two masses is halved the gravitational force is

A | Halved |

B | Doubled |

C | Four times |

D | Same |

Question 121 |

Newton's law of Gravitation states that the force of attraction between the two bodies is inversely proportional to

A | Product of their masses |

B | Square of the distance between them |

C | Square of the distance between their centers |

D | Product of masses and distance between them |

Question 122 |

Newton's law of Gravitation is written as

A | F=Gm1m2/r |

B | F=Gm1m2/r4 |

C | F=Gm1m2/r 3 |

D | F=Gm1m2/r2 |

Question 123 |

The gravitational force between two bodies is

A | Ar Impulsive |

B | Reactive |

C | Repulsive |

D | Attractive |

Question 124 |

Prof. Abdul Salam along with Wienberg and Glashow proved that

A | Electric and magnetic forces are same |

B | Gravitational and magnetic forces are same |

C | Electromagnetic and weak forces are same |

D | Strong nuclear forces .and weak (0-decay) forces are same |

Question 125 |

The motion of planets and galaxies around the sun is due to

A | Electromagnetic force |

B | Electric force |

C | Magnetic force |

D | Gravitational force |

Question 126 |

Newton's Law of Gravitation states that the force of attraction between two bodies is directly proportional to

A | Product of mass and distance between them |

B | Square of the distance between them |

C | Product of their masses |

D | Product of square of their masses |

Question 127 |

The work needed to lift a body of mass 'm' from the surface of the earth to an infinite distance is

A | kinetic energy of the body |

B | Absolute potential energy of the body |

C | potential energy of the body |

D | Elastic potential energy of the body |

Question 128 |

Absolute potential energy of the body at the earth surface is equal to

A | GMe/Re |

B | GMem/Re |

C | GMe/Re 1 |

D | GMe/Re 2 |

Question 129 |

Assume the earth to be homogeneous. Scientist A goes deep down in a mine and scientist B goes up in a balloon. The value of g measured by

A | Each goes on decreasing |

B | Each remains unaltered |

C | B goes on decreasing and that of A goes on increasing |

D | A goes an decreasing and that of B goes on increasing: |

Question 130 |

A body is taken from the earth's surface to the moon. The weight of the body will become zero at a point where force of attraction due to

A | The moon is zero |

B | The earth is zero |

C | The moon and the earth is equal and opposite |

D | Both the moon and the earth is zero. |

Question 131 |

The minimum velocity of projection to escape the earth's gravitation pull is called

A | Terminal velocity |

B | Escape velocity |

C | Orbital velocity |

D | Angular velocity |

Question 132 |

The escape velocity for a body depends on

A | Density of the planet |

B | Mass of the planet |

C | Size of the planet |

D | Jane of these |

Question 133 |

The escape velocity from the earth surface in Km SCC'l is

A | 4.2 |

B | 7.2 |

C | 9.2 |

D | 11.2 |

Question 134 |

The escape velocity of a body depends upon

A | The mass of the body |

B | The mass of the planet |

C | Density of the planet |

D | Volume of the planet |

Question 135 |

When a meteorite. earth into earth's atmosphere, its energy converts into

A | Heat energy |

B | Kinetic energy |

C | Nuclear energy |

D | Mechanical energy |

Question 136 |

If moon's radius is 1600km amI 'g' on its surface isI.6ms-2 then the escape velocity on the moon is

A | 1600ms-1 |

B | 2000ms-1 |

C | 1800ms-1 |

D | 2263ms-1 |

Question 137 |

FOI' a body to escape the earth's gravitational field, its escape velocity should be

A | v2gRe |

B | v2MeG |

C | v2I1lMeG /Re |

D | v2I1lMeG |

Question 138 |

If the minimum initial velocity required to escape a rocket from gravitational pull is 11 x 103 m/s, then the minimum initial velocity to escape a cricket ball will be

A | II x 103 m/s |

B | 11 x 105 m/S |

C | 11 x 104 m/S |

D | 11 x 106 m/S |

Question 139 |

The minimum initial velocity required to take a body. out of earth’s gravitational field is known as

A | Variable velocity |

B | Instantaneous velocity |

C | Escape velocity |

D | Angular velocity |

Question 140 |

The correct expression for escape velocity is

A | 2 R,g |

B | v2 Reg |

C | v2 Rg |

D | v2 R2g |

Question 141 |

The relation between the escape velocity Vesc and orbital speed Vo is given by

A | Vsec = 1/2 V° |

B | Vsec = v2 V° |

C | Vsec = v1V° |

D | Vsec = 1/2 V |

Question 142 |

The huge reservoirs of sui gas are located at Sui in

A | Punjab |

B | MWFP |

C | Sindh |

D | Baluchistan |

Question 143 |

In Pakistan the largest electricity producing dam in Pakistan is

A | Mangla |

B | Warsak |

C | Tarbela |

D | None of these |

Question 144 |

The tidal energy is due to the gravitational pull of

A | Sun |

B | moon |

C | star |

D | planet |

Question 145 |

Pakistan's first nuclear reactor at Karachi (KANNUP) produces electricity

A | 400 megawatt |

B | 600 megawatt |

C | 500 megawatt |

D | 137 megawatt |

Question 146 |

The fossil fuels are

A | Coal. petroleum and natural gas |

B | Wood |

C | Plastic and seed oils |

D | Cotton |

Question 147 |

Oil in its nature or crude form is

A | Unusable |

B | Very cheap |

C | Very useful |

D | None of these |

Question 148 |

Wind' flows from areas of

A | High altitudes to areas of low altitudes |

B | Low temperature to areas of high temperature |

C | High pressure to areas of low pressure |

D | None of the above |

Question 149 |

The reaction which takes place in Nuclear Reactor is

A | Chemical reaction |

B | Fusion reaction |

C | Fission reaction |

D | Mechanical reaction |

Question 150 |

Solar cells are made up from the material called

A | Iron |

B | Hydrocarbons |

C | Carbon |

D | Silicon |

Question 151 |

In Pakistan, the nuclear power reactors are located at

A | Lahore, Karachi |

B | Quetta, Karachi |

C | Karachi , Chashma |

D | Lahore, Quetta |

Question 152 |

Tidal power stations are installed in the countries

A | Argentina |

B | Alaska |

C | France |

D | All these |

Question 153 |

The largest deposits of coal the world over are found in

A | Russia |

B | U S A |

C | Pakistan |

D | Saudi Arabia |

Question 154 |

Tarbela dam is constructed on the river

A | Ravi |

B | Indus |

C | Kabul |

D | jhelum |

Question 155 |

The energy released in fission reaction is

A | Tidal energy |

B | Solar energy |

C | Wind energy |

D | Nuclear energy |

Question 156 |

The solar energy absorbed by earth every yeal' is about

A | 4.0 x 10I2 Kwh |

B | 0.4 x 10I2 Kwh |

C | 4.0 x 1015 Kwh |

D | 4 x 10 17Kwh |

Question 157 |

The source of geothermal energy is

A | radioactive decay in the earth's interior |

B | the rotation of earth around the sun |

C | the rotation of earth around its own axis |

D | All the above |

Question 158 |

Unemployment benefits are typically about __________ percent of a person's earnings and last for__________.

A | 50 |

B | 26 weeks |

C | 75 |

D | 1 year |

Question 158 Explanation:

2 years

Question 159 |

The current yield moves inversely to the price

A | |

B | Yes |

C | No |

D | - |

Question 159 Explanation:

1

Question 160 |

The analysis up to this point has assumed that _____does not change over time

A | |

B | Usage |

C | Income |

D | Inflation |

Question 160 Explanation:

3

Question 161 |

t is a positive integer. 4/7 = t/s Quantity A: s Quantity B:7

A | if the quantity in Column A is greater |

B | |

C | if the quantity in Column B is greater |

D |

Question 161 Explanation:

Question 162 |

Quantity A: (x - 1)(x)(x + 1) Quantity B:(x)(x)(x)

A | if the quantity in Column A is greater |

B | |

C | if the quantity in Column B is greater |

D |

Question 162 Explanation:

Question 163 |

In a developmental study of a nematode worm, the positions of two embryonic cells (designated A and B) are switched. Cell A typically develops into the worm's pharynx

A | however, after the switch, descendants of Cell B form the pharynx. Which of the following statements regarding the nematode's development best explains these results? |

B | The nematode undergoes position-dependent cellular interactions. |

C | Different cells of the nematode receive different sets of genes. |

D | Embryogenesis in the nematode is mainly determined by individual cells. |

Question 163 Explanation:

1

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