Question # 1

In case of planets, the necessary acceleration is provided by:

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Gravitational force

Coulomb force

Frictional force

None of these

The velocity of sound in air depends upon

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Density and elasticity of gas

Pressure

Wavelength

Amplitude and frequency of sound

A current of 1 ampere is passing through a conductor. The charge passing through it in half a minute s

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One coulomb

0.5 coulomb

30 coulombs

2 coulombs

None of these

The work done in moving a body between two points in a conservative field is independent of the

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Direction

Force applied

Path followed by the body

Power

Centripetal force for electron is given by

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mv²/ r

mv / r²

mv²/ r

mr²/ v

Ball pen functions on the principle of

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Viscosity

Boyle's law

Gravitational force

Surface tnesion

In velocity of a particle at an instant is 10 m/s and after 5s the velocity of the particle is 20 m/s. The velocity 3s before in m/s is

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8

4

6

7

The rain drop falling from the sky reach the ground with

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Constant terminal velocity

Constant gravitational acceleration

Variable acceleration

acceleration greater than g

A piece of fuse wire melts when a current of 15 ampere flows through it. With this current. If it dissipates 22.5 W, the resistance of fuse wire will be

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Zero

10Ω

1Ω

0.10Ω

If current through conductor is 1 A and length of conductor is 1m placed at right angle to the magnetic field, then the strength of magnetic field is

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F = B²

F = 0

F = B

F = B/2

Which are not the elementary particles?

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Photons

Leptons

Hadrons

Quarks

None of these

Single mode step index fibre has a very thin core of about diameter

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5.5 μm

9.5 μm

5.0 μm

All of these

Who gave the corpuscular nature of light

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Einstein

Newton

Maxwell

Thomas young

Among the conservative forces, which one is the weakest ?

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Nuclear weak force

Electrostatic force

Gravitational force

None of these

Photoelectric effect and Compton effect prove the:

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Wave nature of light

Particle nature of light

Dual nature of light

Bulk modulus for mercury is

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27

29

29.4

30

The interference fringes are of

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equal width

variable width

zero width

non-uniform width

Is the Gravitational force is conservative ?

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Yes

No

A little

None of these

While passing through the atmosphere, total energy is reduced by the dust particles, water vapours and other gases due to

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Reflection

Scattering

Absorption

All of these

Super conductors are materials like

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Alloys

Ceramic

Semiconductors

a and b

A prism splits a beam of white light into its seven constituent colors.This is so because

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Phase of different colors is diferent

Amplitude of different colors is different

Energy of different colors is different

Velocity of different colors if different

When seen in green light the saffron and green portions of our National Flag will appear to be

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Black

Black and green respectively

Green

Green and yellow respectively

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