Question # 1

The direction of induced current is such that it opposes the very cause that has produced it This is the law of

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Lenz

Faraday

Kirchoff

Fleming

Electrons in the atom are held in the atom due to

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Coulomb forces

Nuclear forces

Gravitational forces

Van der Waal's forces

The velocity of a particle at an instant is 10 m/s and after 5 s 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

Which of the modulus of elasticity is involved in compressing a rod to decrease its length?

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Young's modulus

Bulk modulus

Modulus of rigidity

None of the above

When we apply reverse bias to a junction diode it

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Lowers the potential barrier

Raises the potential barrier

Increase the majority carrier current

Decrease the majority carrier current

Ball pen function on the principle of

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Viscosity

Boyle's law

Gravitational force

Surface tension

Light appears to travel in straight lines since

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It is not absorbed by the atmosphere

It is reflected by the atmosphere

Its wavelength is very small

Its velocity is very large

When n-type of semiconductor is heated

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Number of electrons increases while that of holes decreases

Number of holes increases while that of electrons decreases

Number of electrons and holes remains same

Number of electrons and holes increases equally

A body is dropped from a tower with zero velocity reaches ground in 4s. The height of the tower is about

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80 m

20 m

160 m

40 m

At 0° K which of the following properties of a gas will be zero?

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Kinetic energy

Potential energy

Vibrational enegy

Density

Which of the following is a scalar quantity

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Density

Displacement

Torque

Weight

The peak voltage in 220 volt A.C. supply is nearly

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220 volt

253 volt

311 volt

440 volt

In case of p-n junction diode, at high value of reverse bias, the current rises sharply. The value of reverse bias is known as:

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Cut off voltage

Zener voltage

Inverse voltage

Critical voltage

If tube length of astronomical telescope is 105 cm and magnifying power is 20 for normal setting. Calculate the focal length of objective

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100 cm

10 cm

20 cm

25 cm

The velocity of falling raindrops attains limited value because of

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Up thrust of air

Viscous force exerted by air

Surface tension effect

Air currents atmosphere

When boron is added as an impurity to silicon, the resulting material is.

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n type conductor

n type semiconductor

p-type conductor

p-type semiconductor

The direction of induced current is such that it opposes the very cause that has produced it. This is the law of

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Lenz

Faraday

Kirchoff

Fleming

Ball pen function on the principle of

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Viscosity

Boyle's law

Gravitational force

Surface tension

A body of mass 2 kg is thrown up vertically with K.E. of 490 joules. If the acceleration due to gravity is 9.8 m/s², the height at which the K.E, of the body becomes half its original value is given by:

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50 m

12.5 m

25 m

10 m

Steel is preferred for making springs over copper. Why?

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Steel is cheaper

Young's modulus of steel is more than that of copper

Young's modulus of copper is more than that of steel

Steel is less likely ot be oxidized

With the increase of temperature viscosity

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Increase

Decrease

Remains same

Doubles

The fundamental unit which has same power in the dimensional formula of surface tension and viscosity is:

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Mass

Length

Time

None

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