Question # 1

When a water droplet falling freely through air, the drag force on water droplet increases with th

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decrease in speed

increase in speed

pressure

none of them

In flesh, light element like carbon, hydrogen and oxygen predominate. Three elements allows ______ amount of incident X-ray to pass through them

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Small

Greater

Equal

Sometimes

The wave form of S.H.M will be

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square wave

sine wave

rectified wave

saw-tooth wave

If work is done at the rate of 2 k j per second, then total work done is half an hour will be:

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0.5 Kwn

2 Kwh

1 Kwh

None of these

The mass of the object is a quantities measure of its

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speed

velocity

acceleration

inertia

The projectile motion is composed of

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horizontal motion only

vertical motion only

horizontal and vertical motion

none of them

Max Planck received the Nobel Prize for his discovery of energy quants in:

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1718 AD

1918 AH

1818 AD

1918 AD

None of these

The emitter-base junction of a transistor is forward-biased and collector-base junction is reverse-biased. If the base current is increased, its

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I_cwill decrease

V_CEwill increase

I_Cwill increase

V_CCwill increase

A boat of mass 40 kg is at rest, A dog of mass 4 kg moves in the boat with a velocity of 10 m/s. What is the velocity of boat?

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4 m/s

2 m/s

8 m/s

1 m/s

Associated with the motion of a driven harmonic oscillator, there is a very striking phenomenon, know as

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waves

beat

interference

resonance

The pressure exerted by the gas is

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directly proportional to the P.E

inversely proportional to the P.E

inversely proportional to the K.E

directly proportional to the K.E

The high blood pressure is known as

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Diastolic

Systolic

High blood pressure

None of these

The unit of torque in SI system is

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Newton-meter

Dyne-meter

Newton

Joul

The weight of the body at the centre of the earth is

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9.8 N

Zero

19.6 N

None of these

How the fringe spacing varies as the separation of the slits increases

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Increases

Decreases

Increases very little

None of these

The vertical velocity component changes with

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Distance

Time

Height

Angle

The bands below the valence band are

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completely filled and play active part in conduction process

completely filled and plays no part in conduction process

not completely filled and play active part in conduction process

not completely filled and play no part in conduction process

The dimensions of coefficient of viscosity are

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ML^-1T²

ML²T¹

ML^-1T¹

Nono of these

In an interference fringes pattern the fringes are

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Equally spaced

Wider near the centre and narrower away from it

Narrower near the centre and wider away from it

None of these

Alexander graham bell transmits a voice message via a

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Beam of light

Telescope

Compound microscope

Mirror

The vector product of two non zero vectors is zero when

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They are parallel to each other

They are perpendicular to each other

They are equal vectors

They are inclined at angle of 60°

A tank full of liquid has an orifice 4.9 m below the surface level in the tank, the velocity of out coming liquid is

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4.9 ms^-1

9.8 ms^-1

2 x 9.8 ms^-1

4 x 9.8 ms^-1

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