Question # 1

For a moving body, at any instant of time

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If the body is not moving the acceleration is necessarily zero

If the body is slowing, the retardation is negative

If the body is slowing, the distance is negative

If displacement, velocity and acceleration at that instant are known, we can find the displacement at any given time in future

The induced current in a conductor depends upon

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Resistance of the loop

Speed with which the conductor moves

Any of these

Both A and B

None of these

Which of the following quantities remain constant in step up transformer?

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Current

Voltage

Power

Heat

The closed loop gain of the inverting amplifier is written as

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G = R₂/R₁

G = 1 + R₂/R₁

G = -R₂/R₁

G = 1 - R₂/R₁

A ball falls on the surface from 10 m height and rebounds to 2.5 m. if the duration of contact with the floor is 0.01 seconds then the average acceleration during contact is

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2100 m/s²

1400 m/s²

700 m/s²

400 m/s²

In a transistor, if the central region is p-type then this type of transistor is known as

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p-n-p transistor

n-p-n transistor

either of these

none of these

In a normal healthy person the value of systolic pressure is

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75 torr

80 torr

120 torr

all of them

A heat engine is that which converts

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mechanical energy into thermal energy

thermal energy into mechanical energy

K.E into potential energy

heat energy into light energy

If we draw a graph between d(along x-axis) and F (along y-axis) and get a straight line horizontal to x-axis then area under this straight line represents:

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Power

Work

Pressure

None of these

Heating effect of current utilized in:

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Electric motor

Electric toaster

Electroplating

Electric kettle

Both (B) and (D)

The machines which deals with the objects moving with velocities approaching that of light is called:

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Relativistic mechanics

Wave mechanics

Quantum

Statics mechanics

Pressure exerted by a gas in merely momentum transferred to the walls due to the continuous collisions of molecules of the gas

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Per unit area

Per sec per unit area

Certain area

None of these

Near and far points of a healthy human eye respectively are

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0 and 25 cm

0 and infinity

25 cm and 100 cm

25 cm and infinity

The dimensions of Planck’s constant “h” are same as that of:

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Momentum

Angular momentum

Work

Torque

Which one is the case when the wavelength is actually changed?

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When source move relative to observer

When observer move relative to source

When observer moves around a stationary source at the center of circle

When the relative displacement between source and observer is zero

The fundamental unit which has same power in the dimensional formula of surface tension and viscosity is:

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Mass

Length

Time

None

A body of mass 10 kg is dropped to the ground from a height of 10 meters.The work done by the gravitational force is (g = 9.8 m/s²)

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-490 Joules

+ 490 Joules

- 980 Joules

+ 980 Joules

The efficiency of the diesel engine is

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25% to 35%

25% to 40%

35% to 40%

30% to 40%

When seen in green light the saffron and green portions of our National Flag will appear to be

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Black

Black and green respectively

Green

Green and yellow respectively

When the car moves with constant accelerations, the velocity time graph is a

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Straight line

Straight line rises equally

Horizontal straight line

None of these

In slow Compression of a gas in a cylinder is reversible as the compression can be changed to expansion by

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Rapid decreasing the pressure

Slowly decreasing the pressure

Extremely decreasing the pressure

None of these

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