Question # 1

A point charge Q is placed at the mid-point of a line joining two charges. 4q and q. if the net force on charge q is zero. then Q must be equal to

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-q

+q

-2q

+4q

The excess (equal in number) of electrons that must be placed on each of two small spheres spaced 3 cm apart, with force of repulsion between the spheres to be 10^-19N, is

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25

225

625

1250

Inverter is the name given to:

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NOT gate

OR gate

NOR gate

AND gate

XOR gate

A heat engine is that which converts

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mechanical energy into thermal energy

thermal energy into mechanical energy

K.E into potential energy

heat energy into light energy

A particle of mass 5.0 mg moves with a speed of 8.0 m/s. Its de-Brogile wavelength is

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1.66 m

1.66 x 10^-10m

1.66 x 10^-29cm

1.66 x 10^-29m

Pressure applied at any point of gas at rest is transmitted equally to all parts of the gas. This is the statement of:

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Newton's second law

Pascal's law

Carnot theorem

Second law of thermodynamics

When the p-n junction is forward biased its resistance is of the order of

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few mega ohms

few kilo ohms

few ohms

few milli ohms

The nature of capacity of electrostatic capacitor depends on

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Shape

Size

Thickness of plates

Area

Surface density of charge is defined as

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Charge per unit volume

Charge per unit length

Charge per unit area

Charge per unit mass

A person is sitting in a traveling train and facing the engine. He tosses up a coin and the coin falls behind him. It can be concluded that the train is

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Moving forward and gaining speed

Moving forward and losing speed

Moving forward with uniform speed

Moving backward with uniform speed

The RMS value of alternating current is:

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0.7 times at the peak value

0.5 times the peak value

0.7 times the Instantaneous value

Equal to maximum voltage

None of these

The ratio of the gravitational force F_gto the electrostatic force F_ebetween two electrons at the same distance apart is approximately

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9.8

24 x 10¹⁹

24 x 10⁴²

24 x 10^-44

The emitter-base junction of a transistor is forward-biased and collector-base junction is reverse-biased. If the base current is increased, its

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I_cwill decrease

V_CEwill increase

I_Cwill increase

V_CCwill increase

The force which maintain the strict long-range order between atoms of a crystalline solid is the:

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Nuclear force

Cohesive force

Adhesive force

Coulomb force

None of these

Glass and high carbon steel are the examples of

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brittle substances

ductile substances

plastic substances

elastic substances

The current in microamperes required to produce one millimeter deflection on a scale placed one meter away from the mirror of the galvanometer, defined the sensitivity of

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ammeter

voltmeter

galvanometer

avo-meter

Tick the one which is not a crystalline solid:

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Zirconia

Glass

Copper

Ceramic solid

An ionic compound

An alpha particle has a charge of

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+2e

-2e

-e

+3e

If a train traveling at 72 kmph is to be brought to rest in a distance of 200 meters then its retardation should be

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20 ms^-2

10 ms^-2

2 ms^-2

1 ms^-2

Motional emf is called motional:

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Electromagnetic force and is measured in newtons

Electromotive force and is measured in volt

Electromotive force and is measured in newtons

Electromagnetic force and is measured in volts

None of these

If the slope of the velocity-time graph increases at constant rate with time, then the body is said to have

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uniform deceleration

uniform negative acceleration

average acceleration

uniform positive acceleration

The conduction band in a solid

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may be empty

cannot be empty

should be filed

all of them

According to Einstein, with the great increase in the speed of the body, the relativistic mass of the body

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Remains constant

Decreases

Increases to infinity

Reduced to zero

The emf is measured in:

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Newton

Volt

J/C

Both A and B

Both B and C

In magnet-coil experiment, emf can be produced by:

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Keeping the coil stationary and moving the magnet

Keeping the magnet stationary and moving the coil

Relative motion of the loop and magnet

Any one of above

All above

The SI unit of magnetic flux is.

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weber

Nm^-1A^-1

tesla

gauss

Rate of decay is actually described by.

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Half line

Decay constant

Mean life

Total life

None of these

The distance covered by a body in unit time is called.

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Displacement

speed

Velocity

Both B and C

A body moving with an acceleration of 5 m/sec²started with velocity of 10 m/sec. What will be the distance traversed in 10 seconds?

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150 m

250 m

350 m

400 m

The SI unit of magnetic flux is

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NmA^-2

NmA^-1

NAm^-1

Nm²A^-1

The velocity of sound is greatest in

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Water

Air

Vacuum

Metal

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