Question # 1

Bernoulli's equation is based upon law of conversation of

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mass

momentum

Energy

None

Example of progressive wave is

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transverse waves

longitudinal waves

both of them

none of them

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)

If the instantaneous velocity of a body does not change. the body is said to be moving with

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average velocity

uniform velocity

instantaneous velocity

variable velocity

In the equation E=mc² value of c is?

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186000 miles per hour

186000 miles per sec

3 X 10⁸m/sec

Both A and C

Both B and C

A person starts his journey from a point 0, travels 4 Km SW, then 4 Km NW, and finally 4 Km north-east. At what distance is he now from point 0?

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0 Km

4 Km

8 Km

12 Km

The solids are classified as:

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Metals

Crystalline

Amorphous

Polymeric

All except (A)

In the stress-strain graph, stress is increased linearly with strain until a point is reached, this point is known as

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plastic limit

plastic deformation

proportional limit

elastic behaviour

Each atom in a metal crystal vibrates about a fixed point with an amplitude that:

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Decrease the rise in temprature

Is not affected by rise in temprature

Increase with rise in temprature

Both (B) and (C)

None of these

If water in a closed bottle is taken up to the moon and opened, the water gets

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Freeze

Boiled

Dissociated into O₂and H₂

Evaporated

Three resistance 500,500 and 50 ohms are connected in series across 555 volts mains. The current flowing through them will be

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0.52 A

1 mA

0.7 mA

1.4 A

The relative permitivity ∈_r for rubber is

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2.8

3.0

2.90

2.94

The excess (equal in number) of electrons that must be placed on each of two small spheres spaced 3 cm apart,with force of repulsion between the spheres to be 10^-19 N,is

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25

225

625

1250

The reason why weight exists is that

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the earth exerts gravitational force on objects

both the earth and any object on it has mass

gravity exists

All of them

The angle between the vector 2i + 2j and the y-axis is

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Tan^-1 (3/2)

Tan^-1 (2/3)

Sin^-1 (2/3)

Cos^-1 (3/2)

The effect is to increase the inflation the bag is

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To compress the blood vessels

To increase external pressure

To cut off the flow of blood

All of these

At points where the crest (or trough) of one wave coincides with the crest (or trough) of the other wave, the wave produces

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destructive interference

constructive interference

diffraction

dispersion

A polarizer is used to

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Reduced intensity of light

Produce polarized light

Increase intensity of light

Produce unpolarised light

The speed of the secondary wavelets as mentioned in Huygen's principle is ________ the speed of propagation of the wave itself

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Equal to

Greater than

Smaller than

None of these

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 positions

do not oriented along external field and also do not returns to original random position

none of them

One erg is equal to

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10⁵j

10^{7 j}

10^-3 j

10^-7j

If a train traveling at 72 kmph is to be brought to rest in a distance of 200 meters,then its retardation should be

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20 ms^-2

10 ms^-2

2 ms^-2

1 ms^-2

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