Question # 1

Fluid A is more viscous than fluid B. While flowing through a pipe of the same dimensions and material which fluid takes longer to travel at 25°C?

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fluid B

fluid A

both take the same time

not possible to determine from given information

In which of the following diodes when an electron combines with a hole during the forward biasing, photon of visible light is emitted.

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photo diode

light emitting diode

photo voltaic cell

all of them

Back emf is produced due to

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Self induction

Mutual induction

A.C

Lenz's law

The most suitable material for permanent magnet is

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cobalt

iron

steel

alaminium

The branch of physics which deals with the properties of fundamental particles is called:

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High energy physics

Molecular physics

Astrophysics

Space physics

magnetic field is a:

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Vector quantity

Scalar quantity

Scalar as well as scalar quantity

Any of (A) or (B)

Neither (A) nor (B)

Resistance is measured in

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volts

ampere

ohm

watt

The magnitude of chemical Effects depends upon:

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Nature of liquid

Quantity of Electricity passed through the liquid

Color of the liquid

Both (A) and (C)

Both (A) and (B)

When quarter of a circle is completed, the phase of vibration is:

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90°

180°

45°

360°

When two spherical conducting balls at different potentials are joined by a metallic wire, after some time:

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Both the conductors are at the same potential

Potential difference across the conductors remain constant

Potential difference across the conductors becomes zero

Both (A) and (B)

Both (A) and (C)

Direction of motion ______ in circular motion:

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Changes off and on

Changes continuously

Does not change

None of them

A (100 W , 200 W) bulb is connected to a 160 V power supply. The power consumption would be

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64 W

80 W

100 W

125 W

Acceleration of a body is positive, if the velocity of the body is

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constant

increasing

decreasing

none of them

Range of a projectile is R, when the angle of projection is 30° . Then, the value of the other angle of projection for the same range, is

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45°

60°

50°

40°

The least distance of distinct vision is:

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10 cm

25 cm

50 cm

100 cm

An A.C varies as a function of

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Current

Voltage

Time

Charge

A point on the rim of a wheel moves 0.2 m where the wheel turns through an angle is 14.3 degrees. The radius of the wheel is:

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0.05 m

0.08 m

0.8 m

0.008 m

The time period of a simple pendulum is independent of its:

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Length

Mass

Value of g

Both A and B

The highest value reached by voltage or current in one cycle is called

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root means square value

peak value

peak to peak value

instantaneous value

Selenium is:

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An insulator

A conductor

Insulator in the dark and becomes conductor when exposed to light

Conductor in the dark only

None of these

Aerodynamics is a branch of:

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Hydrodynamics

Thermodynamics

Both of them

Statics

In the text book, the transistor amplifier circuit is a:

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Common emitter circuit

Common collector circuit

Common base circuit

Any of these

None of these

Blood is an

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Compressible fluid

incompressible fluid

hard

none of them

For normal operation of transistor, the batteries

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V_CCis of much lower value than V_BB

V_CCis of much higher value than V_BB

V_{CC is equal to}V_BB

none of these

Area under the force displacement graph gives

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Power

Work

Heat

Energy

If you are moving at relativistic speed between two points that are a fixed distance apart, then the distance between the two points appers

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larger

shorter

equal

none of these

The percentage of available heat energy converted into work by a petrol engine is roughly

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35 %

40 %

35 to 40 %

25 %

Which of the following can become a good permanent magnet

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iron

steel

both of them

none of them

The sources of magnetic field are

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isolated magnetic poles

charges at rest

charges in motion

none of these

A body moves a distance of 10 m along a straight line under the action of a force of 5 N and work done in 25J. The angle which the force makes with the direction of motion will be

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60°

90°

30°

0°

First law of thermodynamics is consequence of conservation of

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Work

Energy

Heat

All of these

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