Question # 1

A curie represents a very strong source of

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α-particle

β-particle

γ-particle

none of these

Which are not the elementary particles?

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Photons

Leptons

Hadrons

Quarks

None of these

The magnetic field outside the solenoid due to current is

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strong

zero

weak

uniform

A dirty carpet is to be cleaned by heating. This is an accordance with____ law of motion:

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First

Second

Third

None of these

Which of the following can become a good permanent magnet

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iron

steel

both of them

none of them

The principle of superposition states that

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The total displacement due to several waves is the sum of the displacement due to those waves acting individually

Two stationary waves superimpose to give two progressive waves

A diffraction pattern consists of many interference patterns superimposed on one another

Two progressive waves superimpose to give a stationary wave

A monkey sits on the pan of spring scale kept in an elevator. The reading of the spring scale will be maximum when

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Elevator is stationary

Elevator cable breaks and it falls freely towards earth

Elevator accelerates downwards

Elevator accelerates upward

Centripetal acceleration is also called ______ acceleration

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Tangential

Radial

Angular

None of them

Surface tension of water is due to

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Inter molecular attractions

Inter molecular spaces

Inter molecular repulsion

None of above

Fog droplets are suspended in air when their weight is balanced by:

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Force of gravity

Upward trust due to air

Surface tension

None of these

If two bodies of equal masses moving in the same direction collide elastically, then their velocities.

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Are added

Are subtracted

Do not change

Are exchanged

Torque is a turning effect of a

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Body

Momentum

Force

None of these

In thrill machine rides at amusement parks, there can be an acceleration of

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2 g

3 g

More than 3 g

4 g

Which of the following frequency ranges includes most of the electromagnetic waves emitted by the ultra - violet tubes used in a sun bed?

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5 x 10⁵ to 5 x 10⁸ Hz

5 x 10⁸ to 5 x 10¹¹ Hz

5 x 10¹¹ to 5 x 10¹⁴ Hz

5 x 10¹⁴ to 5 x 10¹⁷ Hz

Fringe spacing ΔY is the distance between two adjacent bring fringes on the screen is

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ΔY = Lλ/d

ΔY = Ld/λ

ΔY = dλ/L

ΔY = Lλ/d m

What is the weight of a 700 g of body on a planet whose mass is 1/7th of that of earth and radius is 1/2 of earth?

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400 gf

300 gf

700 gf

500 gf

When a stress change its shape it is called

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Tensile stress

Shear stress

Volume stress

None of these

In order to get interference using two light rays:

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The sources should be monochromatic and coherent

The sources should have the same frequency

Superposition should be linear

All of these

All real heat engines are less efficient than carnot engine due to

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Work substances

Friction

0 K

All of these

A container has a small hole in the bottom.Air can go through this hole,but water cannot,this can be best explained by the statement that

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Water contains hydrogen atoms,air does not

Water molecules are larger than molecules in the air

Water molecules are smaller than molecules in the air

Surface tension of the water prevents it from

Law of conservation of momentum has been verified for the

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Cosmological level

Microscopic level

Submicroscopic level

a and c

How many fringes will pass a reference point if the moveable mirror of a Michelson s interferometer is moved 0.06 mm The wavelength of light used is 5.89 x10^-3 mm

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200

300

20.4

2.3

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