Question # 1

The number of protons inside a nucleus is called

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mass number

atomic weight

atomic number

none of these

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

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Relativistic mechanics

Wave mechanics

Quantum mechanics

Statics

When a force of 0.5 N displaces a body through a distance of 2m in the direction of force, the work done is:

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0.5 J

2 J

0.25 J

1 J

In a transistor, the central region is called

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collector

emitter

base

none of them

A particle of mass 0.5 g moving along x-axis is located of x₁= 15 m at t₁= 5s and x₂= 33 m at t₂= 13s its average velocity is

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6 m s^-1

2.45 m s^-1

2.25 m s^-1

4.45 m s^-1

Parallel vectors of same magnitudes:

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Are equal

Are unequal

When added give the some equal to zero

Give the answer equal to zero

The arrangement or molecules or atoms in a crystalline solid can be studied by using:

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Chemical methods

Neutrons

X-ray techniques

Copper atoms

Both (A) and (B)

When a body moves to and fro motion, this type of motion is called

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translatory motion

circular motion

oscillatory motion

all of them

Which quantity has different dimension?

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Tension

Work

Energy

Torque

A hollow insulated conduction sphere is given a positive charge of 10μC. What will be the electric field at the centre of the sphere if its radius is 2 meters?

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Zero

5μC m^-2

20μC m^-2

8μC m^-2

The temperature at which the vibrations become so great that structure of the Crystal breaks up, is called:

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Critical temparature

Temperature of vaporization

Melting point

Both (A) and (C)

Both (A) and (B)

If there were no intermolecular forces between gas molecules, the pressure due to a given sample a gas will be

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Increased

Decreased

Unchanged

None of these

Huygen's principle states that:

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Light travels in straight line

Light has dual nature

Either of these

None of these

An axis which is at right angle to both X and Y and Y axes direction is in space is called

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Unit vector axis

Zero vector axis

Z-axis

None of these

The blood pressure of man

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Increase with age

Decrease with age

Remains same

Cannot predicted

The property of bending of light around obstacies is called

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interference

reflection

diffraction

polarization

The unit vectors is not restricted to Cartesian coordinate system only. Unit vectors may have

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Specific direction

Any direction

Not a and b

None of these

The light source in the transmitter can be either

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Light emitting diode

Semiconductor laser

Light emitting in an invisible infra red

All of these

When a plane polarized light is passed through certain crystals they

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Are totally absorbed

Are totally reflected

Rotate the plane of polarization

None of these

If P is the pressure of gas than K.E per unit volume of gas is

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P/2

P

3/2 P

2P

Unit of universal gas constant is SI is:

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W K^-1 mol^-1

J/Nk^-1 mol^-1

Jk^-1 mol^-1

erg K^-1 mol^-1

If stress is increased beyond the elastic limit and change in solid is permanent this behaviour is called

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Elasticity

Plasticity

Conductivity

Insulator

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