Question # 1

Dull black surface is a best:

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Emitter

Absorber

Reflector

None of these

When equal opposite forces are added then the resultant force is ______________

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Double

Triple

Zero

None of these

Plasma exist in _______________

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Earth

Satellite

Moon

Sun

The process in which heat is transfer due to actual movement of molecule is called.

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Conduction

radiation

Convection

All of these

Ship and boats are designed on the principal of

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Charge

Densities

Volume

Floatation

Evaporation takes place from liquid :

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Everywhere

Above surface only

Below surface only

Middle of liquid

On Uranus the daytime temperature is ___________

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216 °C

-216 °C

-200 °C

-100 °C

Latent heat of vaporization is denoted by:

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H1

Hm

Hv

Hf

Rate of change of momentum is equal to:

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Mass

Torque

Weight

Force

Hydraulic press in works on:

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Pascal's law

Hook's law

Archimedes law

Principle of floatation

On heating Air becomes.

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Heavier

Lighter

Remain same

None

The speed of sound in the air at one atmospheric pressure at room temperature is:

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343 ms-1

346 ms-1

349 ms-1

339 ms-1

The mirror whose inner surface is reflecting is called:

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Concave mirror

Convex mirror

Mirror

Lens

The refracted light striking to the side of prism is called:

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Refracted ray

Incident ray

Reflected ray

Emergent ray

A large ripple tank with a vibrator working at a frequency of 30 Hz produces 25 complete waves in a distance of 50 cm.

The velocity of the wave is:

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53 cms^-1

60 cms^-1

750 cms^-1

1500cms^-1

Which is not a hardware:

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CPU

Window

Keyboard

Mouse

A positive electric charge:

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Attracts other positive charge

Repels other positive charge

Attract a neutral charge

Repels a neutral charge

The half -life of carbon is

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5730 years

5700 years

5720 years

572 years

Electronics is a branch of:

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Mass

Applied Physics

Mechanics

Nuclear Physics

When a heavy nucleus splits into, lighter nuclei, the process would .

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Release nuclear energy

Absorb nuclear energy

Release chemical energy

Absorb chemical energy

Snell' law is:

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n = sin<x/sin <r

n=sin <i/sin<r

n = sin <r/sin<i

<i/<r

What is the voltage across a 6 Ω resistor when 3 A of current passes through it:

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2 V

9V

18 V

36 V

In red light is used as compare to blue light then fringe spacing.

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Decreases

Remain same

Increases

Becomes zero

A₁b₁= A₂b₂represents

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Stock's law

Newton's law

Equation of continuity

Brenoulli's equation

The magnifying power of an astronomical telescope is 10. If the focal length of objective is 100 cm, then what is the focal length of eye piece.

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10 cm

100 cm

1000 cm

5 cm

The relation between the speed and hoop can be written as

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2

4

1/2

1/4

A 2 meter of high tank is full of water. If a hole appears at its middle, then the speed of efflux is.

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4.4 ms-1

10 ms-1

6.2 ms-1

20 ms-1

The speed of sound is greater in solids due to their high.

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Density

Pressure

Temperature

Elasticity

If amplitude of a simple pendulum is increased by 4 times the time period will be.

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Four times

Half

Same

Two times

One complete round trip of a body is called

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Displacement

Time period

Vibration

Frequency

The path followed by a projectile in known as its

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Range

Trajectory

Cycle

Height

the wavelength of transverse wave travelling with a speed 'v' having frequency 'f' in equal to

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f/v

Vf

V/f

f/V2

Watt -m2 is the unit of

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Energy

Intensity

Power

Work

If a charge Q flows through any cross section of the conductor in time t, the current I is

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I=Qt

Alpha particle carries a charge.

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-e

+2e

-2e

No charge

An A.C. voltmeter reads 220 V, its peak value will be

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225 V

240 V

311.12 V

300 V

The dimensions of Plank's constant is same as that of.

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Energy

Power

Acceleration

Angular momentum

Logic gate can control some physical parameters like.

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Temperature, Pressure

Resistance, Inductance

Capacitance, Impedance

Current, voltage

If the length and number of turns of a solenoid are doubled strength of magnetic field with.

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Be doubled

Become half

Not change

Be four time

Curie is unit of.

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Conductivity

Binding energy

Radioactivity

Resistivity

The number of crystal system are

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Three

Five

Seven

Fifteen

If the distance between two charges is halved and charges are also doubled, then force between them will be.

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Two time

Four time

Eight time

Sixteen time

Which particle has larger range in air.

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Alpha rays

Gama rays

Beta rays

Neutron

The P.D develop in case of silicon is:

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0.7V

0.3V

0.5V

0.9V