Question # 1

Free electrons are

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tightly bound

fixed

loosely bound

tightly fixed

The speed of a pendulum is measured to be 3.0 s in the inertial reference frame of the pendulum. What is its period measured by an observer moving at a speed of 0.95 c with respect to the pendulum

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2.9 s

3.0 s

6.6 s

9.6 s

If force and displacement are in opposite direction, the work done is taken as:

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Positive work

Negative work

Zero work

Infinte work

A changing magnetic flux creates around itself

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An electromotive force

An electric field (changing electric flux)

Magnetic field

None of the above

The analysis of the distribution of wavelengths of the radiation emitted from a hot body set the foundation of new mechanics, known as

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classical mechanics

Newtonian mechanics

quantum mechanics

statistical mechanics

A stationary sound wave has frequency 165 Hz (speed of sound in air = 330 m/s) then distance between two consecutive nodes is

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2 m

1 m

0.5 m

4 m

An electronic computer is basically a vast arrangement of electronic switches which are made from

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Resistors

Transistors

N -type crystals

P-Type crystals

Capacitors

The smooth or steady streamline flow is known as

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laminar flow

turbulent flow

both of them

none of them

Teh consumption of energy by a 1000 watt heater in half an hour is:

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5 Kwh

0.5 Kwh

2.5 Kwh

3.2 Kwh

When a platinum wire is heated, it appears yellow at

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1600°C

900°C

1100°C

1300°C

The substance in which atoms are so oriented that the field produced by spin and orbital motion of the electrons might add up to zero,are called

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diamagnetic substances

ferromagnetic substances

paramagnetic substances

all of them

If the water falls from a dam into a turbine wheel 19.6 m below,then the velocity of water at the turbine is

(Take g = 9.8 m/s²)

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9.8 m/s

19.6 m/s

39.2 m/s

98.0 m/s

Two charges are placed a certain distance apart in air. When a metallic sheet is placed between them the electric static force between them will

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Decrease

Increase

Remains unchanged

Become zero

A ray of light passing from a rarer to a denser medium

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Bends towards normal

Bends away from normal

Suffers no change in direction

None of these

Two water pipes of diameters 4 cm and 8 cm are connected with a supply line.The velocity of flow of water in the pipe 4 cm diameter is

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1/4 times

4 times

Twice

1/2 of 8 cm diameter pipe

For total internal reflection to take place, the angle of incidence must be ______ than critical angle and the light should travel from ______ to ______ medium

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Greater, rarer, denser

Smaller, rarer, denser

Smaller, denser, rarer

Greater, denser, rarer

The kinetic energy of a body becomes four times its initial value.The new linear momentum will be

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Four times the initial value

Thrice the initial value

Twice the initial value

Same as the initial value

Dimension of momentum is

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ML^-1T

M^-1LT

MLT

MLT^-1

The time taken by light for its passage from M to m and back is

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2c/d

d/2c

2d/c

d²/2c

In a never system, the repeaters are placed at about

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50 km

75 km

100 km

125 km

A compound microscope is consists of objective of

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Long focal length and short focal length of eye piece

Objective of very short focal length and eye piece of long focal length

Objective of very short focal length end eye piece of also short focal length

None of these

Which of the following have same SI units

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Force

Impulse

Momentum

b and c

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