Question # 1

A black body is

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an ideal absorber

an ideal radiator

both of them

none of them

An object undergoes S.H.M has maximum speed when its displacement from the mean position is

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maximum

zero

half of the maximum value

one third of the maximum value

The emf is measured in:

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Newton

Volt

J/C

Both A and B

Both B and C

The unit of conductance is

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ohm

meter

mho

ohm-meter

The SI unit of stress is

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N/m²

Nmc

dynes/m

N

Referring to above figure, a changing current in coil P can be produced:

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At the instant the switch is closed

At the instant the switch is opened

With the help of rheostat

All of these

None of these

The size of the domain is such that they can contain

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10²to 10⁴atoms

10⁴ to 10⁸atoms

10⁸to 10¹²atoms

10¹²to 10¹⁶atoms

A typical rocket consumes about

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100 kg s^-1of fuel

1000 kg s^-1of fuel

10000 kg s^-1of fuel

100000 kg s^-1of fuel

Such an inductor coil which does not consume energy and is often employed for controlling a.c. without consumption of energy is called

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Choke

impedance

Semi-conductor

None

Light appears to travel in straight line because

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It is not absorbed by the atmosphere

It is refracted by the atmosphere

Its wavelength is very small

Its velocity is very large

In the reverse process, the working substance passes through the same stages as in the direct process and

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thermal effects at each stage are exactly reversed

mechanical effects at each stage are exactly reversed

thermal and mechanical effects at each stage remain the same

thermal and mechanical effects at each stage are exactly reversed

Most motorbikes have ____________ cylinder/s engine but cars usually have _________ cylinders on the same crankshaft.

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Four , Six

One , four

two , five

None of these

A material with high retentively and large corcivety most useful to make

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Electromagnet

Permanent magnet

Choke

None of these

According to Stoke's law drag force depends on

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Initial velocity

Final velocity

Terminal velocity

Instantaneous velocity

The rate of change of momentum of a molecule is equal to:

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Pressure

Work

Density

Force

The relation between Cp and Cv is given by

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Cp = Cv

Cp < Cv

Cp > Cv

None of these

220 cm³of water, when subjected to a stress of 100 atmosphere, becomes 219 cm³. Find the bulk modulus of water

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100 N m^-3

100 N m^-2

22000 N m^-3

22000 N m^-2

Ordinary light has components of vibrations in all possible planes. Such light is

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Unpolarized light

Polarized light

Both

None of these

nuclear physics deals with

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Atom

Atomic nuclei

Elementary particles

Light

A tank containing water has an orifice in one vertical side. If the centre of the orifice is 10 m below the surface level in tank, then velocity of efflux is

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44 ms^-1

14 ms^-1

10 ms^-1

49 ms^-1

The phenomenon of blending of around edges of an obstacle is called:

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Interfarance

Defraction

Polorisation

None of above

The least count of stop watch is 0.10 sec,The time of 20 vibrations of pendulum is 40 sec The maximum possible percentage uncertainly in time period is

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0.016

0.10

0.001

0.005

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