Question # 1

A ball with initial momentum p its a solid wall and bounces back with the same velocity. Its momentum p after collision will be.

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P' = p

P' = - P

P' = 2P

P' =-2P

The correct order of comparison for the terminal speeds of a raindrop snowflake, and hailstone is.

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Raindrop= Snowflake = Hailstone

Rindrop>Snow flake>Hailstone

Hailstone>SRaindrop>Snowflake

Snowflake>FRaindrop>Hailstone

For an objec moving with terminal velociyt, its acceleration.

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First increasse than decreases

Is zero

Increass with time

Decrease with time

SI unti of linear momentum is

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kgm-1 s-1

kg m s-1

kg m2 s-1

Nm

What happpens to the arrangement of particles when a solid is heated and turns into a liquid

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Particles change their state from solid to gas

Particles move farther apart

Particle sbecome more closely packed

Partcles chagne thier state

Particles start vibrating in fixed positions

Which one is a better choice for a liquid in glass thermometer is that.

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Wets glass

Is colourless

Is a bad conductor

Expand linearly

Conservation of Linear momentum is equivalent to.

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Newton's Firs law of motion

Newton's second law of motion

Newton's third law of motion

None of these

Four students measure the diameter of a cylinder with vernier callpers. Which of the following readings is

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3.4 cm

3.47 cm

3.5 cm

3.475 cm

Teh pressure exdrted by a aman one the surface of earth will be smaller when be

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Stands on both feet

Sites on the ground

Sleeps on the ground

Stands on one leg

Which branch of science plays vital role in technology and negineering.

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Biology

Chemistry

Physics

Geology

The rate of change of momentum of free falling body is equal to its.

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Size

Velocity

Weight

Momentum

A unit of electric charge, equal to the charge of 6.25x10¹⁸ electrons is:

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Electricity

Coulomb

Electric potential

Volt

An electric current in conductors is due to the flow of:

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Positive ions

Negtive ions

Positive charge

free electron

What happen to the atomic number of an element which emits one alpha particle?

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Increase by 1

Stays the same

Decrease by 2

Decrease by 1

electric field is weak when:

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lines are far apart

lines are close together

no lines are present

lines are directed outside

Mathematical formula of electromotive force (e.m.f) is:

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E = W/Q

E = Q/W

E = WQ

E = W2Q

At mean position of pendulum, the potential energy of the pendulum is:

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Maximum

Minimum

Much more

Both a and c

The current which changes its direction is called:

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Current

A.C.

Conventional current

D.C.

Sound waves having frequency higher than 20,000 Hz are called:

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Ultrasonic

Infrasonic

Audible

Echo

One byte is equal to:

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7 bits

5 bits

8 bits

9 bits

Radioactive isotopes present in atmosphere is

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Cobalt -60

Ph-32

Carbon -14

Carbon -20

The formula of time period of simple pendulum is:

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T = 2π √L/g

T = 2π (L/g)

T = 2π√1/g

T = 1/2π √L/g

The process of confining the beam of light to vibrate in one plane is called.

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Interference

Diffraction

Polarization

Total internal refraction

The efficiency of diesel engine is about

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25% to 30%

35% to 40%

40% to 50%

50% to 60%

Sound wave can not be

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Reflected

Refracted

Diffracted

Polarized

Damping is the process in which energy

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Increases

Remains constant

Dissipates

None of these

Food rich in proteins is:

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potato

grapes

vegetables

bread

A typical rocket consumes fuel about

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40000 Kgs-1

30000 Kgs-1

20000 Kg s-1

10000 Kgs-1

A man of 1 kg is freefalling. The force of gravity is

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1 N

9.8 N

0.5 N

Zero

The angle between x-axis, y-axis and z-axis is

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45°

60°

75°

90°

The work done will be maximum when angle between F and d.

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180^o

0^o

90^o

60^o

The equations of angular motion hold only in case when the axis of rotation is

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Moving

Fixed

Both a and b

None of these

[LT-2] is demensional formula for

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Acceleration

Velocity

Force

Momentum

Disintegration of photon on striking a nucleus into an electron and positron is known as.

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Annihilation of matter

Compton effect

Pair production

Photo electric effect

The peak value of alternating current is 5√2 A. The mean square value of current will be:

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5A

2.5A

5√2A

5²

If a charge is at rest in a magnetic field then force on charge is

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Zero

Double

One fourth

Four times

By increasing the temperature of conductor, the flow rate of charges.

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Increase

Remains constant

Decreases

Changes exponentially

The output from a full wave rectifier is

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An ac voltage

A dc voltage

Zero

A pulsating unidirectional voltage

For rectification we use.

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Transformer

Diode

Choke

Generator

The electric flux through closed surface depends upon

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Charge

Medium

Geometry

Charge and Medium

Total flux through a closed surface depends on.

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Shape of surface

Medium only

Charge enclosed only

Charge and Medium

After curie temperature.

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Ferromagnetic

Paramagnetic

Magnetic

Diamagnetic

The Weber is unit of measure of:

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Conductance

Electric current

Magnitic flux

Electric flux

The expression P = VI hold only when current and voltage are.

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In phase

Out of phase

At right angle to each other

At angle of 120 ^o