Question # 1

The distance travelled byα-particle in a medium before coming to rest, is called

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range ofγ-particle

range of neutrons

range of particle

none of these

In the production of beats by 2 waves of same amplitude and nearly same frequency, the maximum intensity to each of the constituent waves is

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Same

2 times

4 times

8 times

Unit of viscosity is:

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Kg m^-1sec^-1

N s m^-2

J s m^-3

All of these

In metallic crystals which of the following thing remains constant

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amplitude of oscillations

temperature of solid

average atomic positions

all of them

Which of the following can become a good permanent magnet

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iron

steel

both of them

none of them

The threshold frequency of sodium is 6 x 10⁶MHz. The cut-off wavelength for this metal will be

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500 m

500 nm

500 km

500 cm

None of these

If one of the pipes has a much smaller diameter than the other and are placed horizontally then form both sides of Bernoulli's equation, we can drop the term

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P

1/2 fv²

pgh

none of them

The figure 1.007276μ shows the mass of an:

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Atom

Positron

Electron

Neutron

Proton

If a process cannot be retraced in the backward direction by reversing the controlling factors, it is

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a reversible process

an irreversible process

any one of them

both of them

A full-scale deflection is obtained in a galvanometer with a current of few

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ampere

volts

milliampere

ohm

The waves which propagate by the collision of material particles are known as

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e.m. waves

mechanical waves

light waves

microwaves

The reciprocal of decay constant λ of a radioactive material is:

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Frequency

Half life

Year

Mean life

None of these

If the stress increased beyond the elastic limit of the material. the deformation produced in the material will be

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permanent

temporary

either of them

none of them

Mass of proton is of order of

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10^-31gm

10^-27kg

10^-24gm

10⁺²⁷kg

The counter, which also provides the power to the G.M. tube is called:

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Thin mica window

thin glass window

Airy window

Wooden window

None of these

A mass difference of 0.0012 u is equivalent to and energy of:

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0.5 Me V

1.13 MeV

5.13 MeV

1.13 keV

1.13 eV

Mathematical manipulation of the two quantized states can be best carried if they are represented by

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high - low

yes - no

on - off

0 - 1

The behaviour of gases is well accounted by the kinetic theory based on

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microscopic approach

macroscopic approach

both of them

none of them

Range of a projectile is R, when the angle of projection is 30° . Then, the value of the other angle of projection for the same range, is

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45°

60°

50°

40°

Davision and Germer performed experiment to verify

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de-Brogile hypothesis

theory of relativity

Newton's law of gravitation

Mass-energy relation

What must be changing when a body is accelerating uniformly?

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the force acting on a body

the velocity of the body

the mass of the body

the speed of the body

Phenomenon of radioactivity is due to disintegration of

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nucleus

neutron

proton

molecule

In an elevator moving vertically up with an acceleration 'g' the force exerted on the floor by a passenger of mass M is

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Mg

1/2 Mg

Zero

2 Mg

The working of galvanometer depends upon torque exerted on a current carrying coil in

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magnetic field

electric field

gravitational field

nuclear field

Origin of the electric and the gravitational forces

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Was known in 1911 A.D.

Was known in 1811 A.D.

Was known in 1711 A.D.

is still unknown

Was known in 1611 A.D.

The phase determines the

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displacement

amplitude

frequency

state of motion of vibrating body

The intensity of emitted energy (with wavelength) radiated from a black body at different temperatures was initially measured by:

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Lummer

Planck

Pringsheim

Both (A ) and (B)

Both (A) and (C)

Hydrogen atom with only one proton in its nucleus, and one electron in its orbit is called

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deuteron

deterium

protium

tritium

For the working of a heat engine, there must be

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a source of heat at high temperature

a sink at low temperature

both of them

none of them

The substance in which atoms cooperate with each other in such a way so as to exhibit a strong magnetic effect, are called

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diamagnetic substances

ferromagnetic substances

paramagnetic substances

all of them

The direction of the acceleration is the same as that of

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speed

velocity

both of them

none of them

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