Question # 1

When force and displacement are perpendicular to each other than work is equal to

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Unity

Infinity

Zero

-Fd

Light year is a unit of

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Time

Distance

Velocity

Intensity of light

Work is product of:

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Force and velocity

Heat and energy

Force and displacement

None of these

In case of streamed lined flow of liquid, the loss of energy is

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Maximum

Minimum

Infinite

equal to what is in turbulent flow

Bernoulli's equation is based upon law of conservation

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Mass

Momentum

Energy

None 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

1 gm-cm^-3is equal to:

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10³kg-m^-3

10^-3kg-m^-3

1 kg-m^-3

10⁶kg-m^-1

Strictly speaking, the earth is:

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An accelerated frame of reference

A non-inertial frame of reference

An inertial frame of reference

^{A non-accelerated frame of reference}

Both (A) and (B)

A boat of mass 40 kg is at rest, A dog of mass 4 kg moves in the boat with a velocity of 10 m/s. What is the velocity of boat?

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4 m/s

2 m/s

8 m/s

1 m/s

The maximum displacement of a body on either side of its equilibrium position is called

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frequency

amplitude

displacement

time period

A ray passing through optical center of a lens, after refraction:

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Passes through focus

Go deviated

Retraces its path

Both B and C

Light waves are

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Transverse waves

Longitudinal waves

Compressional wave

None of these

The study of nature has been classified into branches are:

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Two

Three

Four

None of these

Experiments revealed that the ratio of the stress to the strain is a constant value for

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different material

all material

a given material

all of them

The frequency of the fundamental mode of open at one organ pipe is 400 Hz. Ifone end of pipe is closed the fundamental frequency will be

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800 Hz

600 Hz

400 Hz

200 Hz

The drag force increases as the speed of the object

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Decreases

Increases

Decreases rapidly

None of these

A truck and a car are moving with equal velocity. On applying the brake both will stop after certain distance then

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Truck will cover less distance before rest

Car will cover less distance before rest

Both will cover equal distance

None

The relation for the diffraction pattern, when it is minimum

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d/2 sin θ = λ

sin θ = λ/2

d sin θ = λ

None of these

Bernoulli's equation related to pressure, fluid speed and height which is

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An important equation

Principle equation

Fundamental equation

None of these

Action and reaction forces always act on the

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same bodies

different bodies

either of them

neither of them

A line which represents the direction of travel of a wave is known as:

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Spherical wavefront

Locus

Ray

Either B or C

The power loss can also take place due to

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Information received can be inaccurate due to dispersion

Light signal may not be perfectly monochromatic

Signal accuracy may be affected by deflective source

All of these

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