Question # 1

___________ helps us to pick up objects.

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Force

Weight

Friction

Nil

In Einstein's mass-energy equation c means speed of light. Its value is:

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3 x 10^-8 ms^-1

3 x 10⁸ms^-1

3 x 10⁹ms^-1

3 x 10¹⁸ms^-1

When 10 N along positive x-axis and 7 N along negative x-axis are added by head to tail rule. The resultant force is:

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17 N

10 N

7N

3 N

The first man who gave the idea of gravity:

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Hero

Einstein

Newton

Faraday

Land and sea breezes are the result of:

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Absorption

Radiation

Conduction

Convection

A silvery white surface is a :

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Worst reflector

Best reflector

Worst absorber

Best absorber

Independent quantities are taken on

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- x - axis

x -axis

-y-axis

y-axis

What is the effect of lubricicantion?

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Increase friction

No effect

Reduce friction

None

Convection of heat is a process of heat transfer due to;

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Random motion of molecules

Downward motion of molecules

Upward motion of molecules

Free motion of molecules

Feathers of bird give good thermal:

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Conduction

Insulation

Convection

None of these

Which of the following do not effect evaporation?

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Temperature

Wind

Volume

Surface area of liquid

The unit of intensity of sound:

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Wm^-1

Wm^-2

Wm

Wm²

According to Coulomb's law , what happens to the attraction of two oppositely charged objects as their distance of separation increases?

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Increase

Decreased

remain unchanged

can not be determined

Bets can hear sound of frequency up to:

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100,000 Hz

25000 Hz

120,000 Hz

1000 Hz

Which instrument is used to detect current?

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Galvanometer

Voltmeter

Ammeter

Electroscope

Two switches attached in series work on which operation?

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AND operation

OR operation

NOT operation

NOR operation

To hear echoes, the minimum distance of the obstacle from source of sound should be:

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10m

15m

17m

20m

The basic operations performed by a computer are:

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Arithmetic operations

Non-arithmetic operations

Logical operations

Both a and c

Which instrument measures the potential difference:

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Voltmeter

Barometer

Galvanometer

Ammeter

Public address system is the example of :

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Analogue electronics

Digital electonics

Binary system

None of these

Transformer works on _______ supply.

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A.C

D.C

Battery

Both A and B

The ray of light after reflection from concave mirror passes through:

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Centre

Principal focus

Pole

Radius

Motion of projective is

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One dimensional

Two dimensional

Three dimensional

Four dimensional

Teh speed of sound in air is 340 m/s. If the pressure of air is doubled then the speed becomes.

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Double

Half

Four times

Remains same

The dimensions of work are.

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[MLT-1]

[MLT-2]

[ML2T-2]

[MLT]

The time rate of change of angular displacements called.

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Linear velocity

Linear speed

Angular velocity

Angular speed

An oscillating mass-spring system produces

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Sound waves

Electromagnetic waves

Light waves

Periodic waves

According to Newton's formula, the speed of sound in air at STP is

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332 ,ms-1

340 ms-1

350 ms-1

280 ms-1

Einstein's theory gives us the physical picture of how the

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Body moves

Gravity works

Moment of inertia produced

Weightlessness creates

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

A diatomic gas molecules has

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Translational energy only

Rotational energy only

Vibrational energy only

All translational, Rotational and vibrational energy

Speed of sound in vacuum is

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280 ms-1

332 ms-1

333 ms-1

Zero ms-1

Transformation of heat other forms of energy is discussed in

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Thermal physics

Thermodynamics

Atomic physics

Nuclear physics

When some di electric is inserted between the plates of a capacitor, then capacitance.

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Decreases

Increases

Becomes zero

Becomes infinity

An electromagnetic wave goes from air to glass which of the following does not change?

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Radio waves

X-rays

Ultra violet radiation

Ultra sond waves

Compton shift is maximum for scattering angle of photon

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0^o

90^o

180^o

45^o

Efficiency of transformer does not affected by

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Input voltage

Core of transformer

Insulation between sheet

Resistance of coils

A solid having regular arrangement of molecules throughout its structure is called.

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Amorphous solid

Polymeric solid

Crystalline solid

Glassy solid

Shear modulus is expressed as:

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G = tanθ/F/A

F/A/tanθ

F/tanθ

tanθ/A

At 0 K a piece of silicon is a

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Conductor

Semi-conductor

Insulator

All

If a charge body moved against the electric field it will again

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Potential energy

K.E

Mechanical Energy

Electric potential energy

Photo diode is used for detection of.

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Heat

Magnet

Current

Light

Shunt resistance is

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Low resistance

Zero resistance

High resistance

Impedance

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