Question # 1

Racing cars are made stable by :

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Increasing their speed

Decrease their mass

Lowering their center of gravity

Decreasing their width

The bad conductor of heat is:

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Iron

Copper

Air

Aluminum

The quantity of heat absorbed by the body depends upon:

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Colour of surface

Nature of surface

Shape of surface

Both a and b

Mercury is used as thermometric material because it has

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Uniform thermal expansion

Low freezing point

Small heat capacity

All the above properties

Glass and transparent polythene sheets allow radiations of wavelength to pass through them:

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Long

Medium

Short

All

Ability of body to do work due to its height is called.

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potential energy

kinetic energy

gravitational potential energy

elastic potential energy

1 litre is equal to:

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10² m³

10^-3 m³

10³m³

10⁶m³

Liquid pressure at depth h is:

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p/gh

h/pg

pgh

i/pgh

Minor but rapid change in atmospheric pressure cause:

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Poor condition

Intense condition

Windy condition

Pleasant condition

Central heating systems in buildings operate by

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Conduction

Radiation

Convection

Condensation

The scientist who notice that all the freely falling objects hae same acceleration.

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Einstein

Galileo

Coulomb

Newton

The true ratio of a transformer is 10. It means:

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Vs = 10Vp

Ns = Np/10

Ns = 10NP

VS= Vp/10

If Current flowing through switch then the output is expressed as:

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0

1

-1

2

The frequency of silent whistle is:

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20,000 Hz - 25000 Hz

2000 Hz - 25000 Hz

200 Hz - 2000 Hz

25000 Hz

How does sound travel from its source to your ear?

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Byc changes in air pressure

By vibration in wires or strings

By electromagnetic waves

By infrared waves

The distance of the object from the mirror is represented by :

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q

p

m

F

The device which is used to convert sound waves into electrical signal is called:

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Ear piece

Microphone

Transmission channel

Receiver

Capacitors that are used in resonant circuits that tune radios to particular frequencies, such circuits are called:

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Series circuits

Filter circuits

Parallel circuits

AC circuits

Concave mirror formula is given by:

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R = 2r

sin<i/sin<r

1/f=1/p+1/q

1/f=1/p-1/q

What is the amount of current passing through an electric heater, if it takes 1800C charge pass through it in 3 minute:

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16 A

10 A

100 A

0.1 A

When the object is placed beyond 2F of a convex lens, the image formed will be:

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Real, inverted and smaller than the object

Real, inverted and of the same size as the object

Real, inverted and larger in size than the object

Virtual, erect and larger in size than the object

The property of substance, which opposes the flow of current through it is called:

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Resistance

Reactance

Resistivity

None

The efficiency of heat engine whose sink is at 17 ^oC and source at 200 ^oC is.

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38%

63%

80%

90%

A typical diffraction grating has certain number of lines per centimeter whose range is.

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40 to 50

400 to 5000

400 to 500

4000 to 5000

The trajectory of a projectile is.

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Circle

Parabola

Hyperbola

Straight line

The Newton's formula for the speed of sound in air is

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The unit of co efficient of viscosity in S.I system

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Kg -1 ms-1

Kg m-1 s-1

kg -1 m-1

Kg ms-1

Minimum number of unequal forces whose vector sum can be zero are.

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5

4

3

2

Which quantity of the following is dimensionless.

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Angular velocity

Centripetal force

Angular acceleration

Angular displacement

The centre of Newton's fringe is dark due to.

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Destructive interference

Diffraction

Constructive interference

Polarization

Sound wave can not be

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Reflected

Refracted

Diffracted

Polarized

The distance between two consecutive crests of troughs is called

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Time period

Wave length

Frequency

Displacement

The location of near point changes with

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Age

Size of the eye

Sharpness of the eye

None of these

The illustration of the phenomenon of mutual induction is in the device of

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Transformer

Inductor

A.C. Generator

Ammeter

In Wilson cloud chamber, if tracks are thick, straight and continuous, then particle is

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a-particles

ß-particles

Y-rays

All

when an inductor comes close to a metallic object, its inductance is.

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Decreased

Increased

Becomes half

Becomes 4 times

The central region of a transistor is called.

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Emitter

Collector

Base

Neutral

The use of LDR is in the circuit of.

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Logic gate

Rectifier

Oscillator

High Switch

The longest wavelength of Paschen series is.

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656 nm

1094 nm

1875 nm

2000 nm

The product of resistance and conductance is

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1

Resistivity

Conductance

Zero

The uncertainty principle was given by

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De-Broglie

Heisenberg

Einstein

Max Planck

If both the length and radius of the rod are doubled, then the modulus of elasticity will:

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Increase

Decrease

Remains the same

Doubled

Selenium is

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Insulator is dark

Insulator in light

Conductor in dark

Semi conductor in dark

split rings are used in

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A.C. generator

A.C. motor

Transformer

D.C. motor