Question # 1

An object is dropped from a height of 100 m. Its velocity at the moment it touches the ground is:

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100 m/sec

140 m/sec

1960 m/sec

196 m/sec

Electron volt is the unit of

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Potential difference

Energy

Resistance

Capacitance

Computer chips are made from:

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Iron

Silicon

Helium

Stontium

Aluminium

Nucleon means:

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Only electrons

Only neutrons

Only protons

Both (A ) and (C)

Both (B) and (C)

An irreversible heat flow from a hot to cold substances of a system, causes the disorder to

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decrease

remains the same

increase

any one of them

Fidelity refers to

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Reproduction of original sound

Reproduction of original image

Reproduction of music

Reproduction of a CD from original copy

The SI unit of conductivity is

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ohm-m

ohm^-1m^-1

ohm-m^-1

ohm^-1m

A mass spectrograph sort out

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molecules

atoms

elements

isotopes

Fluids can transmit:

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Transverse wave

Compressional wave

Both of them

None of them

In the expression of force experienced by electron, the direction of both v and B are

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parallel

zero

perpendicular

none of them

The short distance between two points direction from its initial point to final point is called:

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Velocity

Displacement

Speed

Distance

The substance in which atoms cooperate with each other in such a way so as to exhibit a strong magnetic effect, are called

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diamagnetic substances

ferromagnetic substances

paramagnetic substances

all of them

A curie represents a very strong source of

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α-particle

β-particle

γ-particle

none of these

If denotes the total number of molecules in cubic vessel such that m is mass of each milecule and I is length of each side of vessel, then mN/I³gives the:

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Force

Density

Work done

Pressure

The open loop gain of OP-AMP is of the order of

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10²

10³

10⁴

10⁵

When a stress changes length, it is called the

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compressional stress

tensile stress

shear stress

any one of them

One newton is a force that produces an acceleration of 0.5 m/sec²in a body of mass:

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2 Kg

3 Kg

4 Kg

8 Kg

A weakly damped system has fairly

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sharp resonance curve

flat resonance curve

both of them

none of them

Matter is made up of very tiny particles called

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Atoms

Molecules

Ions

None of these

The number of vibrating body at any instant from its equilibrium position is called

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displacement

frequency

amplitude

time period

A string is stretched between two points and is plucked at right angles to its length, the vibration produced is:

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Longitudinal wave

Transverse wave

No vibration at all

None of them

An intertial frame of reference is a frame of reference which is

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at rest

moving with uniform velocity

either at rest or moving with uniform velocity

none of these

The value of LDR depends upon intensity of:

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Sound falling on it

Current passing through it

Magnetic field surrounding it

Light falling on it

Non of these

A ball is thrown upwards with a velocity of 100 m/s. It will reach the ground after

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10 s

20 s

5 s

40 s

Electric intensity at a place due to a charged conductor is a

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Scalar quantity

Vector quantity

Semi vector and semi scalar

Dimensionless quantity

Both A and D are true

Resistance of a conductor depends upon

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the quantity of current passing through it

the voltage applied between its end

its dimensions, physical state and nature of its material

all of the above

A coil of constant area is placed in a constant magnetic field. An include current is produced in the coil when:

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The coil is destroyed

The coil is Rotated

The coil is neither destroyed nor rotated

Both (A) and (B)

None of these

The unit of resistance is

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volt

ampere

ohm

coat

The projectile attains maximum horizontal range when it is projected at an angle of

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30°

45°

60°

75°

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

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Decreases

Increases

Remains constant

None of these

According to the second law, which is must to produce work

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a source contains a large amount of heat energy

two sources at the same temperature

two sources at the different temperatures

a source contains a small amount of energy

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