Question # 1

A heat engine is that which converts

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mechanical energy into thermal energy

thermal energy into mechanical energy

K.E into potential energy

heat energy into light energy

If the amplitude of sound is doubled and the frequency reduced to one-fourth, the intensity of sound at the same point will be

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Increasing by a factor of 2

Decreasing by a factor of 2

Decreasing by a factor of 4

Unchanged

A body is thrown from a height h with speed u, it hits the ground with speed V

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The value of V is maximum if the body is thrown vertically downward

The value of V is maximum if the body is thrown vertically upwards

The value of V is minimum if the body is thrown horizontally

The value of V does not depend on the direction of which it is thrown

Electromagnetic radiation or photons interact with matter in

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two distinct ways

three distinct ways

four distinct ways

five distinct ways

The charge carriers in an electrolyte are

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Positive ions

Negative ions

Either A or B

Both A and B

Neither A nor B

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

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The coil is distorted

The coil is rotated

The coil is neither distorted nor rotated

Both A and B

None of these

Drag force increases if speed of the object moving through the fluid:

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Increases

Decreases

Remains constant

None of these

The third band of the colour code:

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Gives the number of zeroes

Is decimal multiplier

Gives the resistance tolerance

Gives the third digit

Both (A) and (B)

The rate at which the free electrons pass through any section of a metallic wire from right to left is:

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Greater than the speed at which they pass from left to right

Less than the speed at which they pass from left to right

The same speed at which they pass from left to right

Any of above

None of them

Gauss(G) is smaller unit of magnetic induction which is related to tesla(T) as

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IT = 10^-4G

IT = 10⁵G

IT = 10³G

IT = 10⁴G

Pressure may be define as _______ per second per unit area:

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Change in force

Change in momentum

Change in energy

Work done

Velocity of sound in a diatomic as is 300 m/sec. what is its rms velocity?

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400 m/sec

40 m/sec

430 m/sec

300 m/sec

The vast majority of solids are in the form of

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amorphous structure

polymeric structure

crystalline structure

all of them

Linear momentum is a

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fixed quantity

constant quantity

scalar quantity

vector quantity

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

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1900

1906

1912

1918

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

All the valence electrons present in a crystal of silicon are bound in their orbits by

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Ionic bond

covalent bond

Molecular bond

Both (A) and (B)

Both (B) and (C)

The figure 1.007276μ shows the mass of an:

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Atom

Positron

Electron

Neutron

Proton

Two sources of sound are said to be coherent if

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The produce sounds of equal intensity

They produce sounds of equal frequency

They produce sound waves vibrating with the same phase

They produce sound waves with zero or constant phase difference all instant of time

Marie curie and Pierre curie discovered:

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Uranium

Polonium

Radium

Both (A) and (C)

Plutonium

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)

The velocity of a body at any instant of its motion is known as

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average velocity

instantaneous velocity

uniform velocity

none of them

Which one of the following wave motions is transverse:

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Wave motion produced in water when a piece of stone is thrown into it

Pulling of weight hanging vertically with a spiral spring

Both of these

None of these

When a large number of atoms are brought close to one another to form a solid, each energy level of an isolated atom splits into sub-levels, called

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energy bands

energy shells

states

all of them

When a nucleus emits an alpha particles, its charge number decreases by

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3

2

6

5

For a n-p-n transistor, the conventional current equation can be written as

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I_E+ I_C= I_B

I_C- I_B= I_E

I_C+ I_B= I_E

I_B+ I_E= I_C

CRO deflects the beam of

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proton

a-particle

electron

neutron

A sinusoidally alternating voltage or current can be graphically represented by a:

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Vector

Rotating vector

Clockwise vector

Anticlockwise voltage vector

None of these

The impedance of RLC series resonance circuit at resonant frequency is

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Greater than R

Equal to R

Less than R

None of these

Proton was discovered by Rutherford in

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1915

1906

1910

1920

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

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