Question # 1

The substances in which, atom are so oriented that their fields support each other and the atoms behave like tiny magnets, are called

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diamagnetic substances

ferromagnetic substances

paramagnetic substances

all of them

For Protium, the mass defect is:

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Infinite

Zero

Very large

A few grams

None of these

The restoring force is ______ amd opposite to the applied force within _____:

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Equal, elastic limit

Different, the walls of the laboratory

Different, elastic limit

None of these

The unit of conductance is

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ohm

meter

mho

ohm-meter

The electrical forces between the molecules of a liquid are

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Repulsive

Attractive

Both A and B

None

The waves which propagate through the oscillations of material particles are known as:

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Mechanical waves

Electromagnetic waves

Any of them

None of them

The photoelectric effect, the maximum energy of photoelectrons depends on the

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particular metal surface

frequency of incident light

both of them

none of them

When the upward drag force of the fluid becomes equal to downward force of gravity of the droplet, then its velocity:

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Starts increasing

Starts decreasing

Becomes constant

Is called escape velocity

Which of the following is an example of a S.H.M?

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motion of a projectile

motion of a train along a circular path

motion of swing

electrons revolving sound the nucleus

On a cold morning a metal surface will fell colder to touch than a wooden surface, because

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Metal has high specific heat

Metal has high thermal conductivity

Metal has low specific heat

Metal has low thermal conductivity

Which of the following is not thermo dynamical function?

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Enthalpy

Work done

Gibb's energy

Internal energy

The minimum distance between a source and the screen for which a real image is possible with a convex lens is

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Its focal length

Twice the focal length

Four times the focal length

Square of the focal length

A railway engine (mass 104 kg) is moving with a speed of 73 km/h.The force which should be applied to bring it to rest over a distance of 20 m is

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3,600 N

7,200 N

10,000 N

100,000 N

S.I unit of stress is

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N/m

N m

Nm^-2

newton

A 500 kg car takes a round turn of radius 0 m with a velocity of 36 km/h.The centripetal force is

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250 N

750 N

1000 N

1200 n

A non-uniform beam of weight 50 N is 2 m long and is supported on a pivot situated in the exact middle of the beam. The centre of gravity of the beam is 0.5 m ot the right of the point where the pivot touches the beam. What weight has to be added to the left side of the beam so that the beam stays perfectly balanced (in equilibrium)?

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25 N

12.5 N

50 N

Not enough information to answer the question

When V₁ is approximately zero then Bernoulli's equation reduces to

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Torricelli's theorem

Venturi relation

Equation of continuity

None of these

When crest of one wave coincides with the trough of the other wave, it give rise to

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dispersion

constructive interference

destructive interference

polarization

In a half wave rectifier circuit operating from 50 Hz mains frequency, the fundamental frequency in the ripple would be:

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25 Hz

70.7 Hz

50 Hz

100 Hz

Angular momentum has the same unit as

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Impulse x distance

Linear momentum x time

Work x frequency

Power x time

The dark areas retain their

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negative charges

positive charges

both positive and negative charge

none of these

The rotational analogue of force in linear motion is given by

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Torque

Linear momentum

Moment of inertia

Angular momentum

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