Question # 1

In a soft iron, domains are

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easily oriented along external field and do not return to original random positions

easily oriented along external field and readily returns to originally random position

do no oriented along external field and also do not returns to originally random position

none of them

Substances that do not flow easily have

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large coefficient of viscosity

small coefficient of viscosity

either of them

none of them

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

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

In above figures, tell which set of graphs shows that a body is moving with uniform velocity:

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(i) and (ii)

(ii) and (iii)

(iii) and (iv)

Fraction of the decaying atoms per unit time is called

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decay atom

decay element

decay constant

decay

If one of the pipes has a much smaller diameter than the other and are placed horizontally then form both sides of Bernoulli's equation, we can drop the term

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P

1/2 fv²

pgh

none of them

If a molecule with momentum mv strikes a wall and rebound then the change in momentum will be:

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-2 mv

Zero

2 mv

mv

The body will move with terminal velocity when it acquires

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minimum speed

zero speed

maximum speed

none of them

Acceleration of body executing SHM is always directed towards

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Extreme position

Mean position

Along the direction of motion

None

Which instrument is expensive and difficult to use?

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Voltmeter

Potentiometer

CRO

Both A and C

Both A and B

Two forces 3 N and 2 N are at an angle 0 such that the resultant is R.The first force is now increased to 6 N and the resultant becomes 2R.The value of θ is

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30°

60°

90°

120°

The period of a satellite when there is critical velocity is

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80 min approx

84 min approx

82 min approx

90 mix approx

A particle is moving along a circular path of radius 5 m with uniform speed 5 m/sec what will be the magnitude of centripetal acceleration when the particle completes half revolution

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10π m/sec²

5 m/sec²

10/π m/sec²

Zero

The earth satellite is a

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Navy object

Revolving object

Accelerating object

Free falling object

For a point source of light the wave front produced are

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Circular

Spherical

Cylinrical

None

When two semiconductors of p- and n-type are brought into contact, they from a p-n junction which act like a:

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Conductor

Amplifier

Oscillator

Rectifier

In uniform circular motion the angular acceleration vector is

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Constant in magnitude and direction both

Constant in magnitude only

Constant in direction only

Varies in magnitude and direction both

The fusion of hydrogen into helium is more likely to take place:

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At high temperature and high pressure

At high temperature and low pressure

At low temperature and low pressure

At low temperature and high pressure

A particle of mass 0.5 g moving along x-axis is located at x₁= 15 m at t₁=5 s and x₂=33 m at t₂=13 s. Its average velocity is

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6 m s^-1

2.45 m s^-1

2.25 m s^-1

4.45 m s^-1

The quantity of motion of the body is called

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Force

Acceleration

Momentum

None of these

High temperature superconductors have temperature

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Above 77 K

Below 77 K

At 77 K

None of these

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