Question # 1

The temperature at which the speed of sound becomes double as was at 27°C is

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273°C

0°C

927°C

1027°C

The force which opposes the applied force producing the displacement in the spring is called

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restoring force

periodic force

centripetal force

resistive force

A grating with high resolving power can distinguish _______ difference in wavelengths :

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Smaller

Larger

Zero

None of these

If a charged spherical conductor of radius 10 cm has potential V at a point distance 5 cm from its centre, then the potential at a point distance 15 cm from the centre will be

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1/3 V

2/3 V

3/2 V

3V

An irreversible heat flow from a hot to cold substances of a system, causes the disorder to

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decrease

remains the same

increase

any one of them

Computer chips are made from

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Conductors

Semiconductors

Insulators

Both A and B

To turn the transistor OFF, the base current is set:

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At maximum value

At zero

Either (A) or (B)

All are correct

None of correct

The peak value of alternating voltage is given by

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Velocity is a

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scalar quantity

vector quantity

constant quantity

none of them

A device which converts Electrical energy into mechanical energy is called as

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Transformer

Generator

Motor

All of these

The graphical representation of ohm's law is

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hyperbola

straight line

ellipse

parabola

The sum of the magnitude of two forces acting at a point is 18 and the magnitude of their resultant is 12. If the resultant is at 90° with the force of the smaller magnitude, then their magnitudes are

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3, 15

4, 14

5, 13

6, 12

Angular frequency 'w' is basically a characteristics of

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linear motion

circular motion

both of them

none of them

The force exerted by the fluid in a hydraulic pump on the piston is 10 cm², the fluid pressure on the piston is, in N/cm²

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20

200

2000

20,000

When a body is moving on a surface, the force of friction is called

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Static friction

Dynamic friction

Limiting friction

Rolling friction

Above a certain velocity of a fluid is called

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turbulent flow

steady flow

either of them

both of them

A ball is dropped downwards After 1 second another ball is dropped downwards from the same point. What is the distance between them after 3 seconds

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25 m

20 m

50 m

9.8 m

The time rate of change of displacement is called:

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Time

Acceleration

Speed

Velocity

Experiments revealed that the ratio of the stress to the strain is a constant value for

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different material

all materials

a given material

all of them

An induced current can be produced by

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Constant magnetic field

Changing magnetic field

Varying electric field

Constant electric field

None of these

A diode characteristic curve is a plot between

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current and time

voltage and time

voltage and current

forward voltage and reversed voltage

In the case of an incompressible fluid in stead flow the net rate of flow of mass entering one end of the tube of flow is equal to the net rate of flow of mass leaving the other end. This equation is called

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Quadratic equation

Equation of discontinuity

Equation of continuity

None of the above

The fourth band is a:

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Silver band

Red band

Gold band

Either A or C

Either A or B

The pointer of a magnetic compass:

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Is affected only by permanent magnets

Align itself parallel to the applied magnetic field

Vibrates in the magnetic field of the current

Aligns itself perpendicular to the magnetic field

Both (C) and (D)

The circuit which is used to smooth the output voltage of the full-wave rectification is known as

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transformer

rectifier

filter

none of these

Capacitance of two or more capacitors

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Increases in series combination

Increases in parallel combination

Remains unchanged

None of the above

The force applied on unit area to produce any change in the shape, volume or length of a body is known as

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strain

elasticity

stretching

stress

OP-AMP has the following input terminals

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one

two

three

four

After alpha decay the atomic number of the atom

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increase by four

decreases by two

increases by two

decrease by four

The sum of positive and negative peak values are usually written as

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P-P value

negative

zero

may be positive or negative

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