Question # 1

The S.I unit of work is :

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J

N

Kg

m

Friction is caused by :

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Shining surface

Rough surface

Polished surface

Nil

What is the effect of lubricicantion?

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Increase friction

No effect

Reduce friction

None

The forces that are parallel to each other and have the same direction are called:

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Like parallel forces

Unlike parallel forces

Resultant forces

Net forces

Least count of physical balance is.

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0.001 g

0.01 g

0.1 g

0.0001 g

Coloured surface is a

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Best emitter

Good emitter

Bad emitter

Wrost emitter

In reading 27.5 first two digits are accurate while third one is.

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Accurate

Correct

Doubtful

In correct

The machine which use unequal masses to find the value of "g" is ________

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Free fall apparatus

Atwood machine

Pulley

None

The unit of torque is:

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N

Nm

m

m/n

If mass of a body becomes half that its energy K.E will be reduce to:

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Zero

Half

Double

4 Times

The earth attracts us due to its __________ mass:

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Little

Zero

Small

Large

the resistance of an ammeter should be:

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high

very high

low

constant

First voice signal was transmitted in the form of electrical signal in:

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1870

1875

1876

1880

The end of solenoid from which lines of force emerge out is called:

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North pole

South pole

North and south pole

None of these

A thermistor is a dependent resistors:

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Heat

temperature

energy

mass

When a ray of light enters from denser medium to rare medium, the angle of incidence for which angle of refraction is 90° is called:

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Angle of incidence

Critical angle

Angle of refraction

Angle of deviation

What type of graph is in between V and I, if metal obeys ohm’s law:

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Curved

Parabola

Straight line

None of these

Joule's law is W = ____________________

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IR/t

IRt²

IR²t

I²Rt

A device which has two way communication is:

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Television

Radio

Hard disk

Mobile phone.

The speed of sound was accurately measured in:

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1736

1737

1738

1739

Which gate is used for safety alarm:

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AND

NANAD

OR

NOR

The difference between the loudness of faintest audible sound and loudness of another sound is called:

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Pitch of sound

Quality of sound

Sound level

Intensity of sound

The horizontal range of a projectile of 30^owith horizontal is same at an angle.

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40^o

45^o

90^o

60^o

the locus of all pint in the same wave of vibration is called.

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Wave front

Diffraction

Interference

Polarization

The SI unit of angular displacement is.

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Degree

Revolution

Radian

Rotation

The ratio of size of image and size of object is

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Focal length

Magnification

Resolving power

Principle focus

When speed of a body is doubled then its

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K.E. is doubled

P.E. is doubled

Acceleration of doubled

Momentum is doubled

Which one is renewable source of energy.

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Coal

Uranium

Biomass

Natural gas

A finite volume of gas consists of

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Small no. of molecules

Large no. of molecule

Average no. of molecule

None of these

In an object is placed in between focus point and Opticla center of a convex lens, the image formed by lens is.

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Real inverted

Virtual diminshed

Virtual inverted

Virtual erected

Increase in speed of sound for 1 ^oC rise in temperature is.

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0.61 ms-1

0.61 cms-1

61 ms-1

6.1 ms-1

If 332 waves pass through a medium in 1 second with speed of 332 ms-1 then wavelength will be

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7 m

332 m

664 m

1 m

In the thermodynamics process , the equation W = -delta U represents.

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Isothermal expension

Isothermal compression

Adiabatic expansion

Adiabatic compression

The charge of an alpha particle is equal to

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-e

+e

-2e

2e

Which device is used as a rectifier?

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Capacitor

Transistor

Diode

Transformer

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

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Transformer

Inductor

A.C. Generator

Ammeter

In RLC series circuit at resonance the phase difference between capacitor and inductor reactance is.

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90^o

270^o

0^o

180^o

The mathematical symbol for NOR operation is

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X = A . B

X = A + D

The anodes in cathode ray oscilloscope.

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Control number of waves

Control brightness of sept formed

Accelerate as well as focus beam

Negative potential w.r.t to chithode

Rectification is the process of converting.

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D.C. into A.C.

A.C. in to D.C.

Low signal to high

High signal to low

The solids are classified as

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Polymeric

Amorphous

Crystalline

All of above

An ECG records the _____ between points on human skin generated by electric process i the heart.

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Heart beat

Pulse rate

Pressure

Voltage

Energy stored in inductor is.

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1/2 L I²

1/2 LI

1/2 L2I

1/2 L2I2

the substances in which the atoms do not form magnetic dipoles are called.

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Diamagnetic

Para magnetic

Ferro magnetic

Crystal