Question # 1

The work performed on an object does not depend on:

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Force applied

Angle at which force is inclined to the displacement

Initial velocity of the object

Displacement

An object is dropped from a height of 100 m. Its velocity at the moment it touches the ground is:

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100 m/sec

140 m/sec

1960 m/sec

196 m/sec

In a semi-conductor material, the total current is

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only the +ve current

only the electronic current

sum of +ve and electronic current

all of them

Which of the following type of force can do no work on the particle on which it acts:

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Frictional force

Gravitational force

Electric force

Centripetal force

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

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constant

increasing

decreasing

none of them

Fluids can transmit:

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Transverse wave

Compressional wave

Both of them

None of them

If the focal length of the convex lens is 5 cm, then to get the real and inverted image of the same size as that of object, the object should be placed at:

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5 cm

10 cm

15 cm

20 cm

Electric field strength is defined as

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Work done on unit charge

Force exerted on unit charge

Distance covered by unit charge

Power exerted by unit charge

None of these

A diode which can turn its current ON and OFF in nono seconds is called:

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LED

Photodiode

An ordinary diode.

Both (A) and (B)

Both (B) and (C)

Coulomb force, when any material medium is placed between two charges

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Increases

Decreases

Remain unchanged

None of these

Which of the following represents an electric current?

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C^-1

CS^-1

J.S^-1

dynes^-1

Pico is the prefix for

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10^-10

10^-12

10^-15

10^-18

An automobile moves with constant speed along a circle of radius 40 m. It takes 2 μ second to complete one circle,The average speed for one complete circle is

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20 ms^-1

40 ms^-1

60 ms^-1

0 ms^-1

Which type of fibre is used to send the signals of long distances?

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single mode step index fibre

multimode step index fibre

multimode graded index fibre

all of them

Torque producing anticlockwise rotation is taken as

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negative

positive

zero

both negative and positive

The state of rest and state of motion are

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Irrelevant

Relative

Both

None of these

The force exerted by the fluid in a hydraulic pump on the piston is 2000 N.If the area of the piston is 10 cm² the fluid pressure on the piston is in N/cm²

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20

200

2000

20000

The cross product of parallel vectors is zero when angle between

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θ 0^o

θ = 90^o

θ = 180^o

a and c

The self product of two vectors in cross product is

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Zero

Square of vector

Only same vector

None of these

The high blood pressure is known as

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Diastolic

Systolic

High blood pressure

None of these

A ball is thrown with a speed of 30 ms^-1_{in a direction of 30}° with the ground. What will be its time of flight?

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3.1 s

1.55 s

0.31 s

15.5 s

In Micheal sons interfrometes apparatus the numbers of mirrors and glas plates are used respectively ara

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2,3

3,2

3,3

2,2

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