Question # 1

When velocity of moving body is doubled, the quantity which is also doubled is its:

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K.E.

Acceleration

Momentum

P.E.

At a given instant, a photon moves in +x direction in a region where there magnetic field in -z direction. The magnetic force on the proton will be the:

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-y direction

+y direction

+z direction

-z direction

None of these

The time interval during which the Voltage source changes its polarity once is known as:

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Time period T

Half the time period

Quarter the time period

Two third of the time period

None of these

Thermistors are prepared under

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High pressure and low temperature

High pressure and high temperature

Low pressure and low temperature

Low pressure and high temprature

None of these

If a force of 0.05 N produces an elongation of 20 mm in a string, then its spring constant will be:

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250 N m^-1

25 N m^-1

2.5 N m^-1

None of these

The effect of applying a force on a moving body is to change

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its direction of motion only

its speed of motion only

both the direction and speed of motion

its inertia only

In a _____ flow, each particle of the fluid is called a streamline and different streamlines ______cross each other.

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Streamline, cannot

Turbulent, cannot

Streamline, can

None of these

Force is a:

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Scalar quantity

Base quantity

Derived quantity

None of these

Energy stored in the spring of a watch is called

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Potential energy

Kinetic energy

Nuclear energy

Elastic potential

The angle between centripetal force and displacement of the body moving in a circle is:

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0°

90°

180°

None of these

Micheal Faraday and joseph Henry belong respectively to:

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USA and England

England and France

England and USA

USA and France

None of these

When a silicon crystal is doped with pentavalent impurity which are

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Boron

Antimony

Gallium

None of these

Which one light source can travel faster through optical fibre is

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Infra red

Visible

Ultra violet

All of these

Fiber optics also used to transmit light

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Around corners

Into inaccessible place

Formerly unobservable objects

All of these

A particular wavelength received from a galaxy is measured on earth and isfound to be 5% more than that its wave length on earth. Hence galaxy is

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Moving towards earth

Going away from earth

Stationary with respect to earth

None

Michelson's interferometer is an instrument used to measure the distance with

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Precision

High precision

Extremely high precision

None of these

Adiabatic change occurs when the gas expands or compresses when contained in an insulated cylinder

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Slowly

Very slowly

Rapidly

None of these

For average velocity of a body, it has

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Straight path

Curved path

Steady motion or variable

All of them

What will be the ratio of the distance moved by a freely falling body from rest in 4^th and 5^th seconds of journey?

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4 : 5

7 : 9

16 : 25

1 : 1

Which of the following is not a projectile?

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a bullet fired from a gun

a spaceship

a football in air

an artillery shell

Two boats rowing close to one another tend to collide.This is due to the

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Air velocity between the narrow gap increases

Pressure between the narrow gap decreases

Both A and B

None

A progressive sound wave is a means of transferring energy. A progressive sound waveof constant frequency is generated in air. The intensity of energy transfer is directlyproportional to another of the wave parameters. Which of the following is correct?

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Intensity 𝖺 (𝑎𝑚𝑝𝑙𝑖𝑡𝑢𝑑𝑒)²

Intensity 𝖺 (𝑝𝑒𝑟𝑖𝑜𝑑𝑖𝑐 𝑡𝑖𝑚𝑒)²

Intensity 𝖺 (𝑠𝑝𝑒𝑒𝑑)²

Intensity 𝖺 (𝑤𝑎𝑣𝑒𝑙𝑒𝑛𝑔𝑡ℎ)²

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