Question # 1

If a ball comes back to its starting point after bouncing off the wall several times, then its

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total displacement is zero

average velocity is zero

none of them

both of them

The commercial unit of electrical energy is :

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K Watt

KWH

Horse power

Joule

The mass 'm' of a body moving at 0.8 c (whose rest mass is mo) becomes

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2 mo

1.67 mo

0.67 mo

2.67 mo

The relationship between Boltzmann constant k with R and N_Ais given as:

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k = RN_A

k =R/N_A

k = NR/N_A

None of these

When weight of an object falling freely becomes equal to the drag force, then the body will move with

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increasing speed

decreasing speed

constant speed

none of them

In which of the following diodes when an electron combines with a hole during the forward biasing, photon of visible light is emitted.

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photo diode

light emitting diode

photo voltaic cell

all of them

The mechanics, which deals with the objects moving with velocities approaching that of light is called:

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Relativistic mechanics

Wave mechanic

Quantum mechanics

Statics

Some charge is being given to a conductor. Then its potential

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Is maximum at surface

Is maximum at centre

Is remain same throughout the conductor

Is maximum somewhere between surface and centre

Curie is a unit of

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reluctance

resistivity

binding energy

radioactivity

A carnot cycle consists of

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One step

two step

three steps

four steps

The density of water is 10³kg/m³. The water pressure on a submarine is 2.0 x 10⁷N/m². The depth of the submarine below the surface of the water, in maters, is approximately

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200 m

11000 m

2000 m

8000 m

Light year is the unit of

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Speed

Mass

Distnace

Time

Dimension of G are

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[ML³T²]

[M^-1L²T²]

[M^-1L³T²]

The size of the domains in such that they can contain

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10²to 10⁴atoms

10⁴to 10⁸atoms

10⁸to 10¹²atoms

10¹²to 10¹⁶atoms

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°

Angular displacement generally expressed in

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Degrees

Revolution

Radian

All of these

If the water exists from the pipe at the rate 1.5 kgs^-1 at speed of 0.3 ms^-1. If the water strikes a wall normally, find the force on the wall is

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5.53 N

5.03 N

1.35 N

0.45 N

The substance, which exists in two or more crystal forms under different conditions is called:

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Isomorphism Substance

Allotropic substances

True substances

Polymorphous substances

The magnitude of the scalar product is

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AB sin Φ

AB cos Φ

AB

None of these

The dimensional formula for the modulus of elasticity is same as that for:

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Stress

Strain

Velocity

Surface tension

Two sources are said to be coherent if they have:

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Same amplitude

Same wavelength

Definite phase relation with each other

None of them

The region of plasticity represents

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Proportional limit σ_p

Elastic limit σ_e

UTS (ultimate tensile strength σ_n)

None of these

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