Question # 1

Kilowatt - hour is unit of _____________

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Power

Energy

Work

K.e

Larger is the area greater will be:

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Radiation

Transfer of heat

Evaporation

Conduction of heat

The vacuum in barometer is called:

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Deep vacuum

Mercury vacuum

Torricellian vacuum

None of above

The resultant vector of given vectors A and B is

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Formula of work is:

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F X S

F X V

F/S

S/F

Speed of the satellites of GPS around earth is:

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3.87 ms^-1

387 kms^-1

3.87 kms^-1

38.7 kms^-1

The unit of torque is:

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N

Nm

m

m/n

Ships and submarines float partially or completely according to:

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Newton's law

Pascal's law

Principle of floatation

None

Rooms are heated using gas heater by:

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Conduction only

Convection and radiation

Radiation only

Convection only

The measure of an object tendency to rotate about same axis is :

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Force

Moment arm

Torque

None of these

The devise used to measure the atmosphere pressure is:

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Rain gauge

Vacuum cleaner

Screw gauge

Barometer

The turn ratios of a transformer is 10. It means.

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I_s = 10I_p

N_s = N_p

N_s = 10 N_p

V_s =V_p /10

A device which has two ways communication is:

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Television

Radio

Hard disk

Mobile phone

V²/R=:

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Power

Energy

Voltage

Resistance

electric field is weak when:

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lines are far apart

lines are close together

no lines are present

lines are directed outside

for which of following ampere second could be the unit:

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energy

current

charge

power

The property of substance, which opposes the flow of current through it is called:

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Resistance

Reactance

Resistivity

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

Human skin, in dry conditions, has a resistance of:

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20,000 ohm

100,000 ohm

30,000 ohm

2000 ohm

Digital technology is used in:

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Bulb

Radar

Electric motor

All of these

The part of waves at which particles of the medium are below the normal position are called:

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Extreme positon

Crest

Trough

None of these

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

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10m

15m

17m

20m

If heat engine absorb 400 J and rejects 200 J heat energy, its efficiency will be.

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25%

50%

70%

100%

Food rich in proteins is:

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potato

grapes

vegetables

bread

A diatomic gas molecules has

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Translational energy only

Rotational energy only

Vibrational energy only

All translational, Rotational and vibrational energy

If the slope of a velocity time graph gradually decreases than body is said to be moving with

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Positive acceleration

Negative acceleration

Uniform velocity

None

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Unit vector

+ve of a vector

Resultant vector

-ve of a vector

Image formed by a concave lens is

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Real

Virtual

Erect

None of these

If 20 waves passes through he medium in 2 sec of 10 ms-1 then he wavelength is.

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200 m

2 m

1 m

0.5 m

In vibrating string, the points where the amplitude is maximum are called.

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Nodes

Antinodes

Troughs

Crests

Horizontal range is maximum when the angle of projectile is.

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0 o

30 o

45 o

60 o

The types of optical fibres are

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Three

Four

Five

Six

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Alpha particle carries a charge.

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-e

+2e

-2e

No charge

Magnetism is related to:

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Stationary charges

Moving charges

Stationary & Movingcharges

Law of motion

the core of transformer is laminated so reduce.

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Magnetic loss

Hysteresis loss

Eddy current loss

Electric loss

A diode characteristic curve is a plot between

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Current and time

Voltage and time

Voltage and current

Forward voltage and reverse voltage

Which of the following is one of the spectral series of atomic hydrogen?

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Brockett series

Balmer series

P fund series

All of above

Which of the following is typical source of alpha particle.

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Strontium -94

Radon -222

Cobalt -60

Zic sulphate

Frequency of x-rays depends upon.

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Number of electrons striking target

Accelerating potencial

Nature of the target

Both B and C

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

A resistance frequency the impedance of RLC parallel circuit is.

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Zero

Infinite

Maximum

Minimum

There is regular arrangement of molecules in:

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Amorphous solids

Crystalline solids

Both a and b

None of above

Which of the following basic force is able to provide an attraction between two neutrons:

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Electrostatic and nuclear b

Electrostatic and gravitational

Gravitational and strong nuclear

Only nuclear force