Question # 1

If K = 150 N/m and elasticity is 0.20 m than:

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F = 30N

F= =31N

F = 32N

F = 29N

Due to _____________ we can watch live programs.

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Natural Satellite

Antenna

Artificial satellite

Nil

Minor but rapid change in atmospheric pressure cause:

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Poor condition

Intense condition

Windy condition

Pleasant condition

In houses, good thermal insulation means _____________ consumption of fuel:

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Lower

Higher

Normal

None

When center of gravity is at the highest position body will be in:

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Neutral equilibrium

Stable equilibrium

Unstable equilibrium

None of these

In summers the railways bends due to:

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Expansion

Contraction

Both

None

Leslie's cube is filled with:

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Cold water

Hot water

Mercury

Air

To make a body more stable ________ should be lowered:

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Axis of rotation

Center of gravity

Stabilty

None

Mass per unit volume is:

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Velocity

Work

Density

None

_____________ easily undo bolt?

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Long spanner

Medium

Short spanner

Every spanner

The work done in lifting a brick of mass 2 kg through a height of 5 m above ground will be:

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2.5 J

10 J

50 J

100 J

Mathematical formula of spring constant is:

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F/x

X/F

F/t

F/m

Why household appliances should be connected in parallel with the voltage source:

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To increase the resistance of the circuit

To decrease the resistance of the circuit

To provide each appliance the same voltage as the power source

To provide each appliance the same current as the power source

Which part of a D.C. motor reverses the direction of current through the coil every half-cycle.

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The armature

The commutator

The burshes

The slip rings

an additional wire used along with live and neutral wire is:

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cable wire

earth wire

grip wire

hot wire

Mathematical form of Ohm's law is:

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V = IR

V = I2R

V = Qt

V = IR2

A.C generator works on the principle of:

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Electrostatic induction

Electromagnetic induction

Law of gravitation

Third law of motion

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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Increases

Decreases

Remains unchanged

Cannot be determined

In electric motor, the brushes are made of:

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Lead

Graphite

Iron

Wood

X=A.B. This equation is used for which operation:

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AND

OR

NOT

NAND

The rate of flow of charge through any cross-sectional area is called:

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potential difference

Energy

Coulomb

Electric current

for which of following ampere second could be the unit:

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energy

current

charge

power

The formula for the power is

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P= W/d

P=W/v

P=W/t

P=Wt

A diatomic gas molecules has

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Translational energy only

Rotational energy only

Vibrational energy only

All translational, Rotational and vibrational energy

Damping is the process in which energy

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Increases

Remains constant

Dissipates

None of these

the louder the sound, the greater will be its.

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Speed

Frequency

Amplitude

Wave length

The SI unit of flow rate are

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m-sec^-2

m³-sec^-1

m³-sec^-2

m-sec^-3

The efficiency of diesel engine is about

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25 % to 30%

35% to 40%

40% to 50%

50% to 60%

Work has dimension lime

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Torque

Momentum

Velocity

Power

The law of conservation of energy is the basis of.

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Stream line flow

Equation of continuity

Bernoulli's equation

Venture relation

In young's double slit experiment for the interference the central region will be

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Dark

Bright

Coloured

None of these

For normal adjustment what is the length of astronomical telescope if focal lengths of astronomical telescope if focal lengths of objective and eye piece are 100 cm 20 cm respectively.

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10 cm

20 cm

5 cm

120 cm

In case the work done in zero.

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Constant pressure

Constant volume

Constant temperature

Constant mass

If F1 and F2 are teh magnetic forces acting on a particle and electron respectively when moving perpendicular to the magnetic field then.

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F1=F2

F1>F2

F1<F2

F1 = 4F2

The total charge of any nucleus is:

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Ze

Z

Both a and b

None of above

Output of D.C. motor is

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A.C. energy

Mechanical energy

Chemical energy

D.C. energy

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Lenz's law

Faraday's law

Ampere's law

None of these

The Weber is unit of measure of:

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Conductance

Electric current

Magnitic flux

Electric flux

The bnding energy for nucleus A is 7.7 Me V and that for nucleus B is 7.8 MeV. Which nucleus has the larger mass?

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Nucleas A

Nucleus B

Less than nucleus

None of these

A current generator device converts:

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Mechanical energy into chemical energy

Chemical energy into electrical energy

Mechanical energy into electrical energy

Both b and c

In AC system we generate sine wave form because:

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It san be easily draw

It produces least disturbance in electrical circuits

It is nature standard

Other waves cannot be produced easily

Antiparticle of electron is.

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proton

Photon

Positron

Neutron

Average value of current and voltage over a complete cycle is.

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Positive

Negative

Zero

Infinite

X -rays are similar in nature to.

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Gama rays

Beta rays

Alpha rays

Cathode rays