Question # 1

If the velocity of body decreases with time then acceleration will be.

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Positive

Negative

Variable

Uniform

Paratrooper while coming down attains a velocity called.

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Variable velocity

Uniform velocity

Average velocity

Terminal velocity

The unit of momentum is :

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kgms^-1

kgms^-2

m sec

None

The bad conductor of Heat is:

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Iron

Copper

Air

Aluminium

Process by which liquids changes into vapors is ............... .

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Vaporization

Evaporation

Boiling

None of above

The formula of torque is:

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L= F x E

E = F x t

t = F x L

E = F x L

Sliding friction can be changed into rolling friction by using:

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Ball bearing

Roller bearing

Both a and b

None of these

S.I unit of gravitational field strength is:

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Nkg

Nkg^-1

Nkg^-2

Nkg^-3

The acceleration of a body moving the uniform velocity is.

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Uniform

Zero

Negative

Variable

A body of mass 5 kg i moving with a velocity of 10 ms^-1. Find the force required to stop it in 2s.

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5 N

25 N

20 N

30 N

The direction of momentum is

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opposite to motion

Along the velocity

Perpendicular to motion

None of these

The S.I unit of potential difference is:

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Ampere

Coulomb

Volt

Watt

Battery converts chemical energy into which energy:

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Mechanical

Electrical

Thermal

None of these

Example of mechanical waves is:

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Radio waves

X-rays

Light waves

Sound waves

the number of waves passing through a point in one second is called:

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time period

cycle

frequency

amplitude

the water waves after striking the hurdle will:

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reflect

refract

diffract

all a b and c

The cathode ray oscilloscope consists of main parts:

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Two

Three

Four

Five

A digital multimeter is used to measure:

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Current

Resistance

Potential difference

All of above

Which types of image is formed by a concave lens on a screen?

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Inverted and real

Inverted and virtual

upright and real

Upright and virtual

The waves in which particles of the medium vibrate perpendicular to the direction of propagation of waves are called:

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Transverse waves

Longitudinal waves

Electromagnetic waves

None of these

The pitch of a sound is most closely related to its:

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Wave form

Period

Amplitude

Frequency

Sun light consist of ____________ colour

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6

7

5

2

The dot product of two vectors A and B will be zero, if angle between A and B is

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Zero

30^o

90^o

180^o

If the tension a stretched string is made four times then the velocity of wave.

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Remains same

Is halved

Becomes twice

Becomes 4 times

A₁b₁= A₂b₂represents

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Stock's law

Newton's law

Equation of continuity

Brenoulli's equation

For a rocket , the change in momentum per second of the ejecting gases is equal.

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Acceleration of the rocket

Momentum of rocket

Velocity of rocket

Thrust acting on rocket

Blood has density equal to that of

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Mercury

Sodium

Honey

Water

The speed of sound in air would become double than ots speed at 10^oC at a temperature of.

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313 ^oC

586 ^oC

859^oC

899 ^oC

The magnifying power is also called

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Resolving power

Angular magnification

Strength of eye

None of these

The behaviour of gases is discussed by

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Knowing their nature

Knowing their temperature

Kinetic theory

Maxwell's theory

Sound waves can not be

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Reflected

Refracted

Polarized

Diffracted

The phenomenon of polarization of light reveals that sun light is

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Longitudinal waves

Transverse wave

Electromagnetic waves

Monochromatic wave

Standard metal according to Michelson's interferometer is equivalent to

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1553163.5 wave meter

3 x 108meter

15503000 meter

None of these

At 0 K a piece of silicon is a

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Conductor

Semi-conductor

Insulator

All

The unit of Rh is.

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ms-1

m

m²

m^-1

Calculate current in 2 2R /4Ω resistor.

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1 A

2R /4Ω

R/3Ω

2R /3Ω

The thermistors convert changes of temperature into.

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Light energy

Electric voltage

Heat

Sound

If the distance between the two charged bodies is halved, the force between them becomes.

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Double

Half

Four times

One times

if time constant in RC series circuit is small, then capacitor is charged or discharged.

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Slowly

Rapidly

At constant rate

Intermittently

In CRO, the output waveform of time base generator is

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Circular

Square

Sinusoidal

Saw-toothed

The SI unit of relative permittivity is.

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Fm-1

C2N-1m-2

Nm2C-2

No unit

The stopping potential for a certain metal is 10 volts. Thus work function for the cathode is.

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10 J

1.6 X 10^-18 J

1.6 X 10^-19 J

1.6 X 10³⁰ J

The charge on Beta particle is

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+e

-e

-2e

None of these

The current induced can be increased by:

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Using a stronger magnetic field

Moving the loop faster

Replacing the loop bay coi of many turns

All of above