Question # 1

Resistor is a device which convert electric energy to

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Heat energy

Chemical energy

Elastic energy

All of the above

A car is turning around a corner at 10 m/sec as it travels along an arc of a circle. If value of centripetal acceleration is 10 m/sec²in this case, find radius of the circular path:

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1 m

5 m

10 m

15 m

A monkey sits on the pan of spring scale kept in an elevator. The reading of the spring scale will be maximum when

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Elevator is stationary

Elevator cable breaks and it falls freely towards earth

Elevator accelerates downwards

Elevator accelerates upward

Dimensions of velocity are

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[L]

[T]

[LT^-1]

[LT^-2]

If the absolute uncertainty of an instrument is 0.0a1 cm, then its least count will be :

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0.005 cm

0.01 cm

0.02 cm

0.001 cm

In case of metallic conductors, the charge carriers are

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Protons

Electrons

Antiprotons

Positrons

Both A and B

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

A condenser of capacity 50μF is charged to 10 V.The energy stored is

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1.25 x 10^-3J

3.75 x 10^-3J

2.5 x 10^-3J

5 x 10^-3J

Crystal of germanium or silicon in its pure form at absolute zero acts as:

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A conductor

A semiconductor

an insulator

Both (A) and (C)

Both (A) and (B)

Magnetic flux and flux density are related by

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Flux density = flux x area

Flux density = flux / area

Flux density = flux - area

None of these

Ammeter is used to measure

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voltage

resistance

voltage and current

current

The angle between two vectors -2î + 3ĵ + k̂ and î + 2ĵ-4k̂ is:

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0°

90°

180°

None of the above

Period of typical radio waves is

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1 × 10^-8 sec

1 × 10^-6 sec

1 × 10^-5 sec

Types of physical quantities are

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one

Two

Three

None of these

Deceleration means the speed of the body is

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Increasing

Decreasing

Just moving

None of these

A wire breaks of stretched by more than 3mm. It is cut into equal parts. Then each part can be stretched with out-breaking by

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0.75 mm

1.5 mm

3.0 mm

6.0 mm

The number of different crystals systems based on the geometrical arrangement of their atoms and the resultant geometrical structures are

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5

7

9

14

Light waves are:

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Mechanical waves

Electromagnetic waves

All of above

None of above

Shear modulus for copper is

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20

27

44

43

If there were no intermolecular forces between gas molecules, the pressure due to a given sample a gas will be

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Increased

Decreased

Unchanged

None of these

If P is the pressure and V is the volume, Then PV will represent:

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Power

Work

Force

None of these

The speed at which light travels within the material depends upon

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Refractive index of medium

Wavelength

Frequency

Intensity

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