Question # 1

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

When a stress changes length, it is called the

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compressional stress

tensile stress

shear stress

any one of them

A choke coil is used as a resistance in

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d.c. circuit

a.c. circuit

d.c. potentiometer circuit

wheatstone bridge

Work done is maximum when angle between force and displacement is:

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0°

90°

180°

None of these

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

The path followed by the projectile is known as:

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Cycle

Hyperbola

Trajectory

Route

The rear wheels of an automobile are rotating with an angular velocity of 14 rev/sec which is reduced to 38 rad/sec in 5 second when brakes are applied. Its angular acceleration is:

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5 rad/sec²

-10 rev/sec²

-10 rad/sec²

-5 rev/sec²

A body moves a distance of 10 m along a straight line under the action of a force of 5 N and work done is 25J. the angle which the force makes with the direction of motion will be:

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60°

90°

30°

0°

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

One mole of any substance contain

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same number of molecules

different number of molecules

may be same or different

none of them

Truth of kinetic energy is confirmed by:

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Diffusion of gases

Brownian motion

Both A and B

None of these

The force which maintain the strict long-range order between atoms of a crystalline solid is the:

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Nuclear force

Cohesive force

Adhesive force

Coulomb force

None of these

The number of input terminals of an op-amp is:

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One

Two

Three

Four

None of these

When a constant potential difference is applied across the conductor, the drift velocity of electrons:

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Increases

Decreases

Remains the constant

Either of these

None of these

Tick the conservation force:

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Tension in a string

Air resistance force

Elastic spring

Frictional force

The direction of velocity is along the direction of

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distance

displacement

acceleration

all of them

In flesh, light element like carbon, hydrogen and oxygen predominate. Three elements allows ______ amount of incident X-ray to pass through them

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Small

Greater

Equal

Sometimes

For Protium, the mass defect is:

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Infinite

Zero

Very large

A few grams

None of these

Examples of physical quantities are:

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Length

Color

Effect of music

All of these

An LED emits light when it is:

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Forward biased

Reverse biased

Operated without battery

Operated with heat source

None of these

A body is moving with constant velocity of 10 m/sec in the north-east direction. Then its acceleration will be:

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10 m/sec²

20 m/sec²

30 m/sec²

Zero

Density is defined as:

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Mass per volume

Volume per mass

Mass x volume

Mass per length

If we increase the length of a simple pendulum four times, its time period will become

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2 times

3 times

4 times

6 times

A change in position of a body from its initial position to its final position is known as

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relative motion

displacement

distance

acceleration

The area under line velocity-time graph is numerically equal to the

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speed of the body

acceleration of the body

distance covered by the body

none of them

Average value of A.C voltage during one cycle is

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1

Zero

Maximum

Variable

Which force is not a conservative force:

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Frictional force

Gravitational force

Electric force

Elastic spring force

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

The magnitude of resultant of three vectors is 3. Its x-component is one, y-component is two, then its z-component is:

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0

1

2

3

The vertical and horizontal range will be equal id angle of projection is

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76°

45°

60°

120°

In radioactive decay, the new element which is formed due to the disintegration of original element is called

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element

daughter element

parent element

none of these

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