Question # 1

Electron is a particle whose mass is:

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Greater than that of a proton

Smaller than of a proton and greater than mass of neutron

Smaller than that of proton or neutron

Greater than that of an atom

Fluid friction is _____ the friction between two solid surfaces:

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Greater than

Smaller than

Equal to

None of these

Self inducede e.m.f. is also called

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Motional e.m.f.

Thermistor

Electrostatic induction

Back e.m.f

When a mass 'm' is pulled slowly, the spring stretches by an amount x_o, then the work done will be

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W=Kx_o

W=1/2Kx_o

W=1/2Kx²_o

W=4Kx_o

Graph of Black body radiation is example of

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Band spectra

Continuo's spectra

Line spectra

All

Distance covered during one vibration of an oscillating body in terms of amplitude A is:

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A

2 A

3 A

4 A

When a force is applied on a body, several effects are possible Which of the following effect could not occur?

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the body rotates

the body speeds up

the mass of the body decreases

the body changes its direction

Radioactivity was discovered by:

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Becquerel

Marie curie

Pierre curie

All of them

None of these

In a heat engine, heat is supplied by the

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cold reservoir

sink

hot reservoir

none of them

The net force acting on a 100 kg man standing in an elevator accelerating downward with a = 9.8 m sec^-2comes out to be

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980 N

580 N

1380 N

Zero

Current provided by a battery is maximum when

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Internal resistance equal to external resistance

Internal resistance is greater than external resistance

Internal resistance is less then external resistance

None of these

The numerical ratio of velocity to speed is

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Less than 1

Less than zero

Greater than 1

Either less than or equal to one

Strain is dimensionless and has

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Units

No units

S.I. units

None of these

As the droplet accelerates the net force acing on it is

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Increase

Decreases

Zero

None of these

To make a permanent magnet, a material should have

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hihg retentivety and small coercive force

low retentivety and high coercive force

low retentivety and small coercive force

high retentivety and high coercive force

Two metallic sphere of radius 1 cm and 2 cm get equal quantity of charge. Which has greater surface charge density

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1^st sphere

2^nd sphere

Both get equal surface

None

According to boyle's law, volume of a given mass of a gas is

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Inversely proportional mass at constant pressure

Directly proportional to pressure at constant temprerature

Inversely proportional pressure at constant temprature

None of these

A body of mass 'm' is moved to a height 'h' equal to the radius of the earth.The increase in potential energy is

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2 mgR

mgR

1/2 mgR

1/4 mgR

Reverse process of vector addition is called

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Negative of a vector

Subtraction of vector

Resolution of a vector

Multiplication of a vector

If moon radius 1600 km and g on its surface is 1.6 ms^-2Then the escape velocity on the moon is

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1600 ms^-1

50.6 ms^-1

50.8 ms^-1

2263 ms^-1

Coplanar forces are those, which act on a

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Single plane

All planes

Common plane

None of these

A 120 m long train is moving in a direction with speed 20 m/s.A train B moving with 30 m/s in the opposite direction and 130 m long crosses the first train in a time

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6 s

36 s

38 s

None of these

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