Question # 1

The temperature scale approved in SI units is:

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Celsius scale

Kelvin scale

Fehrenheit scale

None of these

The electric intensity outside the two oppositely charged parallel metal plates is

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Maximum

Minimum

Zero

Infinite

If a gymnast sitting on a rotating stool with his arms outstretched, brings his arms towards the chest, then its angular velocity will

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Increase

Decrease

Remain constant

None of these

When resistance of a current carrying wire increases due to rise in temperature, the drift velocity of electrons:

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Decreases

Increases

Remains the constant

Either of these

None of these

The resonance will be sharp, if the amplitude decreases rapidly at a frequency

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equal to the resonant frequency

slight different from the resonant frequency

greatly different from the resonant frequency

any one of them

When a mass 'm' is pulled slowly through a distance 'x_o' , the elastic potential energy of the spring would be

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P.E=Kx²_o

P.E= 1/2kx_o

P.E=1/2Kx²_o

P.E=Kx²_o

Battery is charged in motor cars, which is based on

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Chemical effect

Magnetic effect

Electric effect

None

The center of mass of a sphere lies at:

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The axis of the sphere

Circumference of sphere

Center of the sphere

None of them

The volume of a gas will be double of what it is at 0°C (pressure remaining constant) at

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546 K

273 K

546°C

273°C

With the help of 50 K v electron microscope, a resolution of

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0.5 to 1 m to possible

1 m to 10 m is possible

0.5 to 1 nm is possible

1 to 10 nm is possible

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

The least distance of he distinct vision is

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20 cm

22 cm

25 cm

30 cm

The components of a fibre optic communication system is/are

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At transmitter

An optical fibre

Receiver

All of these

The dimensions of ½at²are of

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length

Velocity

Acceleration

TIme

When a constant force is applied on a body it moves with uniform

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Acceleration

Velocity

Speed

Momentum

An electron of charge e coulomb passes through a potential difference of V volts,its energy in 'joules' will be

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V/e

eV

e/V

V

X-ray diffraction has been very useful in determining structure of

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Hemoglobin

Double helix structure of DNA

Blood speed

a and b

For a normal AC cycle, during T/2 to T the diode act as:

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Open switch

full wave rectifier

Close switch

All are correct

Torque is a physical quantity which is

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Scalar quantity

Vector quantity

Constant quantity

None of these

Suppose the water flows out from a pipe at 3 kgs^-1and its velocity changes from 5 ms^-1to zero on striking the ball, then force is

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5.3 N

15 N

17.3 N

19.2 N

Large CR (Time constant) value has

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Small time constant

Large time constant

Equal time constant

None of these

The colour of light is determined by is

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Wavelength

Frequency

Velocity

Amplitude

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