Question # 1

Which process produced cooling effect?

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boiling

freezing

condensation

evaporation

The unit of co-efficient of linear expansion :

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K

K^-1

Jkg^-1 K^-1

None of these

When the cyclist stop pedalling, bicycle stops due to :

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Friction

Momentum

Weight

Mass

kgm²s^-2 = _________

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Newton

Joule

Watt

Coulomb

A ball of mass 1 kg moving wih velocity 2 ms^-1 its momentum will be;

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1 Ns

2 Ns

0.5 Ns

4 Ns

The value of gravitational constant is SI unit is

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0.673 x 10-10

6.673 x 10-11

4.32 x 10-9

5.32 x 10-11

Dull black surface are good ____________

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Absorber

Radiator

Conductor

None of these

The ability of a body to do work is known as

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power

energy

kinetic energy

potential energy

Degree of hotness or coldness a body is called:

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Heat

Internal Energy

Temperature

Potential energy

According to Archimedes principle the density of a substance is determined by using formula

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D = w1/w2 + w1 x p

D = w1w2/w2- w1 x p

D = w1/w2 - w1 x p

D = w1w2/w2- w1 x p

Resultant vector can be found by:

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θ=tan^-1 Fy/ Fx

θ=tan[Fy/ Fx ]

θ=tan^-1[ Fy/ Fj ]

None of these

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

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10 m

15 m

17 m

20 m

Transformer Works on the principle of:

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Self induction

Mutual induction

Electro statatic

Induction

The phenomenon in which radiations convert the matter into positive and negative ions is called:

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Radio activity

Excitation

Ionization

Electrolysis

An object is 14 cm is front of a convex mirror. The image is 5.8 cm behind the mirror. What is the focal length of the mirror?

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4.1 cm

8.2 cm

9.9 cm

20 cm

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

the resistance of conductor is inversely to:

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temperature

length

area of cross section

pressure

The lines will be in the form of concentric circles, if conductor is:

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Circular

Straight

Solenoid

None of these

If the length of a simple pendulum is halved its time period will become:

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T/2

T = T/√2

√2T

2T

The amount of current that can be felt is:

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1A

0.1A

0.001 A

2A

The resistance of voltmeter is:

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zero

low

Very high

10Ω

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

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Refracted ray

Incident ray

Reflected ray

Emergent ray

Pressure of fluid will be low where speed of fluid is.

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Low

Zero

High

Constant

International Telecommunication satellite

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4,6,8 and 10 Hz

4,6,11 and 14 GHz

4,6,8 and 12 Hz

4,8,11 and 16 GHz

_______ is bio fuel

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Water

Petrol

Ethanol

Oil

The unit of solar light inversely is

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Watt

kW m-2

Watt m-2

1 m2

The speed of sound in ari at 0 ^oC is 332 ms-1, Then the speed at 40 ^oC will be

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372 ms-1

356 ms-1

346 ms-1

332 ms-1

The amount of inertia of 10 kg hoop about the axis of rotation perpendicular to its plane having radius 5 m is

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50 kgm2

100 K gm2

150 K gm2

250 K gm2

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10 N and 20 N are acting on a body of mass 2 kg the minimum acceleration will be.

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10 ms-2

20 ms-2

60 ms-2

5 ms-2

The measure of hotness or coldness of a substance is.

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Temperature

Heat

Internal energy

Energy

No body begins to move or comes to rest of itself was given by

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Newton

Pascal

Bernoulli

Bu Ali Sina

Waves transport energy without transporting

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Matter

Force

Momentum

All of these

The reactance of inductor depends upon

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L

All of the above

The peak value of alternating current is 5√2 A. The mean square value of current will be:

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5A

2.5A

5√2A

5²

In D.C. generator, split rings act as.

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Capacitor

Commutator

Resistor

Inductor

Low level radiations effects

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Less of hair

Ulceration

Drop of white blood cells

All

A° is the unit of:

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Energy

Length

Nuclear energy

Work

Sensitivity of a galvanometer can be increased by

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Decreasing the value of torsional couple

Decreasing number of turns

Decreasing area of plane of coil

Decreasing magnetic field

Identify the practical application of electrostatic force.

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Inkjet printer

x rays

Laser

A.C. Generator

Pair production occurs only when energy of photon is at least equal in:

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1.02keV

1.02 eV

1.02 MeV

1.02 GeV

The background radiation to which we are exposed, on the average is.

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1 mSv per year

2 mSv per year

3 mSv per year

4 mSv per year

Reflecting mirrors in laser is used to

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Further stimulation

For producing more energetic lasers

Both (a) and (b)

None of these

Calculate current in 2 2R /4Ω resistor.

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1 A

2R /4Ω

R/3Ω

2R /3Ω