Question # 1

A lift is descending at a constant speed V. A passenger in the lift drops a coin. The acceleration of the coin towards the floor will be

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Zero

g

-g

V + g

In YDS experiment, fringe spacing means the distance between two consecutive ____fringes.

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Bright

Dark

Any of A and B

None of these

During the upward motion of the projectile, the vertical component of velocity.

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Decreases

Increases

Remains constant

None of these

When the particles of the medium vibrate about their mean position, along the direction of the motion of waves, then the waves are called:

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Longitudinal waves

Transverse waves

Water waves

Complex waves

The time taken by light to travel from moon to earth is:

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80 sec

500 sec

1.802 X 10⁴sec

Aerophysics

Which of the following is not a projectile

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a bullet fired from a gun

a space ship

a football in air

an artillery shell

Fraction of the decaying atoms per unit time is called

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decay atom

decay element

decay constant

decay

An electron is accelerated through a potential difference of 50v. its de-Brogile wavelength is

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1.66 x 10^-29m

1.74 x 10^-10cm

17.4 x 10^-6m

1.74 x 10^-10m

A weakly damped system has fairly

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sharp resonance curve

flat resonance curve

both of them

none of them

Peak value of alternative current is:

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one of its Instantaneous value

Equal to its RMS value

The same as its peak-to-peak value

Both (B) and (C)

None of these

When relatively simple molecules are chemically combined into massive molecules, the reaction is called:

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Fission reaction

Fusion reaction

Polymerization

Any of these

None of these

An image formed by a concave lens is always

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Virtual

Real

Inverted

None of these

The maximum stress that a material can withstand is known as

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plastic point

elastic point

yield point

ultimate tensile strength

The rotational analogue of Newtons second law of motion is

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mr²α

mrα

mrα²

None of these

S.I. unit of angular velocity of

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Radian per second

Revolution per minute

Degree per second

None of these

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

To produce same acceleration in the bodies of masses 10 kg and 20 kg the force applied in the second body should be

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Halved

Equal for both bodies

Doubled

Three times

The diameter of the milky way is

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10¹⁵ m

10¹⁷ m

10¹⁸ m

10²⁰ m

Graham Bell photo phone used a modulated beam of

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Reflected sun light

Refracted sun light

Diffracted sun light

None of these

Viscosity of water at 30^oC in Nsm^-2

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0.521 × 10^-3

0.564 × 10^-3

0.594 × 10^-3

0.599 × 10^-3

Reduce the given number up to three significant figures 64.6546

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64.6

64.7

64.66

64.65

The acceleration of a body at some particular instant is called

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Initial acceleration

Variable acceleration

Instantaneous acceleration

None of these

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