Question # 1

The amount of coal used since 1945 up till now as compared to that used in the whole of history before that is

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Much more

Very small

No amount at all

None of these

The magnitude of induced emf depends upon the

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Rate of decrease of magnetic field

Rate of change of magnetic field

Rate of increase of magnetic flux

Constancy of magnetic field

None of these

The pressure will be low where the speed of the fluid is

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Zero

High

Low

Constant

A process in which no heat enters or leaves the system is called

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isochoric process

isothermal process

adiabatic process

none of them

Magnetic effect at a point caused due to flow a current depend upon the

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Quantity of current

Distance from current

Both the quantity of current and distance from current element

None of the all

U-238 present in the natural uranium is about:

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59%

0.007%

99%

39%

19%

According to kinetic theory of gases, molecules of a gas behave like

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Inelastic spheres

Perfectly elastic rigid sphere

Perfectly elastic non-rigid spheres

Inelastic non-rigid spheres

When monochromatic light is allowed to fall on cathode, it begins to emit electrons, these electrons are called

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thermoionic electrons

free electrons

photoelectrons

slow electrons

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5μF

10μF

3μF

6μF

The absolute temperature for an ideal gas is

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directly proportional to the rotational K.E of gas molecules

directly proportional to the vibrational K.E of gas molecules

directly proportional to the average translational K.E.of gas molecules

directly proportional to the P.E. of gas molecules

Work is always done on a body when:

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A force acts on it

It moves through certain distance

None of A and B is correct

Both A and B is correct

When an electron is accelerated through a P.D of one volt it will acquire energy equal to

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One joule

One erg

One electron volt

None of these

What is work done in hitting a 10 kg load of bricks to the top of a building 20 m height ?

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98 J

200 J

980 J

1960 J

The relative permitivity ∈_r for rubber is

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2.8

3.0

2.90

2.94

A sonometer wire 100 cm in length has a fundamental frequency of 330 Hz. Thevelocity of propagation of waves along the wire is

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115m/sec

660m/sec

990m/sec

Huygen's theory cannot explain:

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Diffraction

Interference

Polarization

Photoelectric effect

Gaussian surface may be

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Spherical

Rectangular

Any shape

None of these

If radius of droplet is halved then is terminal velocity in viscous medium

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Doubles

Is halved

Becomes one fourth

Becomes four time

The energy stored in a wound watch spring is

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K.E

P.E

Heat energy

Chemical energy

While applying Guass's Law assuming that the field is

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In different directions

Constant in direction

In all directions

None of these

The velocity of light in vacuum can be changed by changing

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Frequency

Amplitude

Wavelength

None of these

With increase in temperature the viscosity of

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Both gases and liquid increase

Both gases and liquid decrease

Gases increases and of liquid decrease

liquid increases and of gases decreases

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