Question # 1

The output voltage of half wave rectification is in the form of

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a smooth curve

a smooth wave

pulses

all of the above

Surface tension of water is due to

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Inter molecular attractions

Inter molecular spaces

Inter molecular repulsion

None of above

A ball is dropped from a height of 4.2 meters. To what height it will rise if there is no loss of KE after rebounding?

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4.2 m

8.4

12.6

None of these

While describing the motion of a simple pendulum, the frictional effects are

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taken into account

completely ignored

partially ignored

none of them

In a normal healthy person the value of systolic pressure is

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75 torr

80 torr

120 torr

all of them

A 100 Kg car is moving at the speed of 10 m/sec and comes to rest after covering a distance of 50 m. The amount of work done against the friction is:

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+5 X 10¹J

+5 X 10²J

+5 X 10³J

+5 X 10⁴J

Those quantities which can be measured accurately are known as

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Physical Quantities

Scalar Quantities

Vector Quantities

Non Physical Quantities

One newton is a force that produces an acceleration of 0.5 m/sec²in a body of mass:

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2 kg

3 kg

4 kg

8 kg

Transmitting antenna emits

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Magnetic waves

Electric waves

Electromagnetic waves

Sound waves

An eV is unit of:

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Potential

Energy

Work

Power

Both (B) and(C)

According to the Bernoulli's theorem the pressure velocity are

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equal to each other

proportional to each other

inversely proportional to each other

none of them

Huygen's theory cannot explain

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Diffraction

Interference

Polarization

Photoelectric effect

To design a resonant circuit of frequency 100 KHz with an inductor of inductance 5 mH, we need a capacitor of capacitance

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5.07 pF

50 pF

0.507 pF

507 pF

The positive charge moving in one direction is equivalent in all external affects to a:

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Negative charge is moving in the same direction

Positive charge is moving in the opposite direction

Negative charge moving in the opposite direction

Positive charges moving in the same direction

None of these

The bob of a simple pendulum is suspended by

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string

heavy inextensible string

light extensible string

light inextensible string

Electric lines of force

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Intersect each other

Are always parallel

Are always anti-parallel

Never intersect

None of these

An important part of photocopier is:

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Toner cartridge

Deflection plates

Charging electrode

Print head

None of these

When a high energy photon interact with a metal, which of the following effect is most likely to be taken place

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pair production

photoelectric effect

Compton effect

None of these

The ratio of average e.m.f in the coil tot he time rate of change of current in the same coil is called

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Mutual induction

Mutual inductance

Capacitance

Self inductance

The size of the image is maximum when its distance from the magnifying glass is:

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0.10 m

0.15 m

0.20 m

0.25 m

Max plank received the Nobel Prize in physics for his discovery of energy quanta in

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1900

1906

1912

1918

A train cover 90 km in half an hour. the time taken by it to travel 15 km will be:

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20 minutes

48 minutes

10 minutes

5 minutes

The half life of radioactive substances depends upon

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amount of substance

energy of substance

state of substance

temperature of substance

For the working of a heat engine, there must be

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a source of heat at high temperature

a sink at low temperature

both of them

none of them

The highest efficiency of a heat engine whose low temperature is 17°C and the high temperature is 200°C is

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70%

100%

35%

38%

The reactance of a coil when used in the domestic A.C. power supply (220 volts, 50 cycles per second) is 50 ohms. The inductance of the coil is nearly

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2.2 henry

1.6 henry

0.22 henry

0.16 henry

The galvanometer can be made sensitive if the value of the factor C/BAN is

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constant

small

large

none of these

Progressive waves of frequency 300 Hz are superimposed in produced a system of stationary waves in which adjacent nodes are 1.5 m apart. What is the speed of the progressive waves?

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100 ms^-1

200 ms^-1

450 ms^-1

900 ms^-1

Maric Curie and Pieree Curie discovered two new radioactive elements, which are called

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polonium uranium

uranium and radium

polonium and radium

none of these

1 gm-cm^-3is equal to

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10³kg-m^-3

10^-3kg-m^-3

1kg-m^-3

10⁶kg-m^-1

When there is no relative motion between the magnet and coil, the galvanometer indicated

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No current in the circuit

An increasing current

A decreasing current

A constant current

Either B or C

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