Question # 1

Acceleration of a body at any particular instant during its motion is known as

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average acceleration

uniform acceleration

instantaneous acceleration

all of them

Energy is dissipated and consequently the energy mass system do not oscillate indefinitely because of

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very small energy

very large energy

frictional forces

acceleration due to gravity

Newton published laws of motion in his famous book "principia" in

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1867

1667

1676

1687

Frequency of red color as compared to that of violet color is:

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Equal

Smaller

Greater

None of these

0.0001210 has ____________ significant figures.

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Four

Three

Seven

Eight

The work done on the system by the environment is considered as

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positive

negative

zero

any one of them

The SI unit of spring constant is identical with that of

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Force

Surface tension

Pressure

Loudness

A solar cell converts energy of the Sun into:

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Heat energy

Magnetic energy

Light energy

Sound energy

When certain nucleus emits anα particle, its mass number:

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Increases by one

Decreases by one

Remain same

Decreases by four

None of these

Generally a temperature scale is established by using certain physical properties of a material which varies

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nonlinearly with temperature

linearly with temperature

either of them

none of them

Max plank received the Nobel Prize in physics for his discovery of energy quanta in

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1900

1906

1912

1918

Each atom in metal crystal:

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Remains fixed

Vibrates about a fixed point

Moves randomly

Rotates about center of a crystal

None of these

When a body is vibrating, the displacement from mean position:

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Increases with time

Decreases with time

Changes with time

None of these

The phase at the positive peak is

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Π/2

Π

3Π/2

2Π

The resistance of the given conductor can be increased by

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Increasing the area

Changing resistivity

Decreasing the length

None of the above because change does not matter because in any case the volume remains the same

Tick the conservation force:

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Tension in a string

Air resistance force

Elastic spring

Frictional force

Direction of motion ______ in circular motion:

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Changes off and on

Changes continuously

Does not change

None of them

The sum of positive and negative peak values is called:

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Instantaneous value

Peak value

Rms valuie

Peak-to peak-value

None of these

The alternative voltage of current is actually measured by:

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Its RMS value

Square root of its mean square value

Instantaneous value

Peak value

Both (A) and (B)

Most of the geysers occur in:

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Volcanic regions

Magnetic regions

Northern region

None of these

An eV is unit of:

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Potential

Energy

Work

Power

Both (B) and(C)

If a gymnast is sitting on a rotating stool with his arms outstretched, brings his arms towards the chest, then its angular velocity will:

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Increase

Decrease

Remains constant

None of these

In describing function of digital systems, 1 represents:

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Closed switch

True Statement

Lighted bulb

Only (B) and (C)

All are true

In a soft iron, domains are

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easily oriented along external field and do not return to original random positions

easily oriented along external field and readily returns to originally random position

do no oriented along external field and also do not returns to originally random position

none of them

If current through conductor is 1 A and length of conductor is 1m placed at right angle to the magnetic field, then the strength of magnetic field is

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F = B²

F = 0

F = B

F = B/2

The number of different crystals systems based on the geometrical arrangement of their atoms and the resultant geometrical structure are

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5

7

9

14

Which of these is not a radiation detector

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Wilson cloud chamber

cyclotron acceleration

Geiger Miller counter

solid state detector

If the external driving force is periodic with a period compareable to the natural period of the oscillator, then we get

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diffraction

beat

interference

resonance

The electric flux through any surface depends upon:

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Intensity of electric field

Area of the surface

Angle between intensity and area

All of these

None of these

The work done moving a body between two points in a conservation field is independent of the:

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Direction

Force applied

Path followed by the body `

Power

The superposition of the two waves of same frequency and amplitude travelling in the same direction gives to an effect called

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Diffraction

Interference

Polarization

Dispersion

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