Question # 1

__________ is a major source of heat:

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Mercury

Sun

Fire

Moon

Larger number of slots are made in radiators to increase:

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Surface temperature

Surface area

Both A and B

Nonr

The angle between rectangular components of a vector is

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0°

90°

180°

270°

When a horse pulls a cart , the action is on the :

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Cart

Earth

Man

Earth & cart

Evaporation takes place at temperature :

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100°C only

0°C only

35°C Only

At all temperature

Degree of hotness or coldness a body is called:

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Heat

Internal Energy

Temperature

Potential energy

Transfer of heat by the actual movement of molecules from one place to the other is called

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conduction

convection

radiation

waves

The least count of vernier callipers is.

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.01 mm

0.1 mm

.001 mm

.01 m

If 'm' is a mass of a body and 'c' is its specific heat, then its heat capacity is a given by

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m/c

c/m

mc

mc2

The mass of Earth is

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6 x 1018 kg

6 x 1020 kg

6 x 1022 kg

6 x 1024 kg

Mass of earth is approximately _________

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3.7 x 10²⁴ kg

25.94 kg

6.0 x 10²²kg

6 x 10²⁴kg

Waves transfer:

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Energy

Wavelength

Velocity

frequency

Transformer which increase voltage is called.

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Step-up transformer

Step down transformer

D.C.Moter

A.C.genrator

Instrument used for detecting and testing the nature of charge on a body is called:

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Incubator

Spectroscope

voltmeter

electroscope

The particles emitted from a hot cathode surface are:

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Positive ions

Negative ions

Protons

Electrons

A transformer has Np =100 and Ns =500 , if 6 volt D.C is applied across its primary, the induced voltage.

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0 V

30 V

45 V

60 V

Static electricity can be generated by:

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Lubrication

Friction

Motion

Smaller the objects

What is fitted in telephone receiver?

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Electromagnet

Diaphragm

Both a and b

None of these

A device which has two ways communication is:

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Television

Radio

Hard disk

Mobile phone

Image formed on a camera is:

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Real, inverted, and diminished

Virtual, upright and diminished

Virtual, upright and magnified

Real, inverted and magnified

Bouncing back of light after striking the surface is called:

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Refraction

Reflection

Diffraction

Interference

SI unit of electric potential is:

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Watt

Volt

Coulomb

Joule

Height of geo stationary orbit of the satellite above the earth is.

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300 km

250 km

400 km

None of these

INTELSAT VI satellite operates at microwave frequencies of.

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2,4,6,10 GHz

4,6,11 and 14 MHz

4,6,11 and 14 GHz

2,4,6 AND 14 GHz

If the are of a circle equals its radius, then the angle subtended at the center will be

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1 degree

One rotation

One radian

Half rotation

Cloud formation in atmosphere is an example of.

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Isothermal process

Isochoric process

Adiabatic process

Isobaric process

In Michelson's experiment the relation used to find the speed of light is

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16 fc

1/16 fd

16 fd

16/fd

Computer Chips are made of

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carbon

Gemanium

Silicon

Sodium

The subtraction of a vector is equivalent to the addition with

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Same direction

Perpendicular direction

Reversed direction

All of these

The velocity of a projectile is maximum

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At the highest point

At point of launching and just before striking the ground

At half of the height

After striking the ground

Wavelength of a wave for closed pipe having length 'l' in the fundamental mode is.

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2 l

1/2

4 l

l

The resultant of two vectors having magnitude 10 N and 8 N Can not be

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2 N

9 N

18 N

20 N

The branch of physics which deals with the properties of gravitational field, electromagnetic field and nuclear field is called.

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Aerodynamics

Field theory

Acorestics

Hydrodynamics

A resistance frequency the impedance of RLC parallel circuit is.

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Zero

Infinite

Maximum

Minimum

The use of LDR is in the circuit of.

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Logic gate

Rectifier

Oscillator

High Switch

SI unit of reactance is.

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Ohm

Mho

Farad

Henry

A capacitor is charged with a battery and then it is disconnected. A slab of dielectric is now inserted between the plates, Then

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The charge in the plates reduces and potencial difference increase

Potencial difference between the plates increase, stored energy decreases and charge remains the same

Potencial difference between the plates decreases, stored energy decreases and charge remains unchanged

None of them

Which of the modulus of elasticity is involved in compressing a rod to decrease its length ?

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Young's modulus

Bulk modulus

Modulus of elasticity

None of these

Identify the practical application of electrostatic force.

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Inkjet printer

x rays

Laser

A.C. Generator

The domain theory of magnet is important to explain the behaviour of

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Diamagnets

Paramagnets

Ferromagnets

All of these

The crystalline structure of NaCl is.

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Cubical

Hexagonal

Tri gonal

Tetragonal

The mean value of A.C. in a cycle is.

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1

0

I2

Nil

Out of the following which material is brittle.

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Wrought iron

Copper

Tungsten

High steel carbon

The permeability of free space is measured in

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wb A/m

Am/wb

wb/Am

m/wbA