Question # 1

The rectangular components of a vector are equal in magnitude when the vector makes and angle _______with their x-component:

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0°

30°

45°

60°

A tube is tapered from 20 cm diameter to 2 cm diameter, the velocity at the first cross-section is 50 cm/s, then the velocity at the second cross-section is

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50 m/s

20 m/s

40 cm/s

5 cm/s

If the velocity time graph is a straight line parallel to the time-axis, then it means:

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The body is moving with uniform velocity

The body is moving with uniform acceleration

The body is at rest

None of these

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)

Amplitude in SHM is equivalent to ______ in circular motion

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Diameter

Radius

Circumference

None of these

The strength of magnetic field around the current conductor is

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Smaller near the conductor

Greater near the conductor

Greater at the large distance from the conductor

Constant near and away from the conductor

A capacitor is charged with a battery and then it is disconnected. A slab of dielectric is now inserted between the plates, then

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The charge in the plates reduces and potential difference increase

Potential difference between the plates increase, stored energy decreases and charge remains the same

Potential difference between the plates decreases and charge remains unchanged

None of the above

A dimension stands for the ___________ nature of certain physical quantity.

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super

Quantitative

Qualitative

Both B and C

The intensity at a point due to a charge is inversely proportional to

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Amount of charge

Size of the charge

Distance between charge and the point

Square of the distance from the charge

None of these

A body moves a distance of 10 m along a straight line under the action of a force of 5 N. If the work done is 25 J, the angle which force makes with the direction of motion of a body is:

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0°

30°

60°

90°

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

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Relativistic mechanics

Wave mechanic

Quantum mechanics

Statics

If yellow light emitted by sodium lamp in Young's double slit experiment is replaced by blue light of the same intensity:

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Fringe width will decrease

Fringe width will increase

Fringe width will remain unchanged

Fringe will become less intense

If the mass of the bullet is m fiber from a rifle of mass M with a velocity v. The recoiling of rifle is V', then the momentum of rifle is

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The ability of an instrument of reveal the minor details of an object under examination is called

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Resolution

Magnification

Resolving power

Dispersion

The first law of thermodynamics defined as

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Conversion of heat energy into mechanical energy

Conversion of heat energy into vibrational energy

Conversion of heat energy into translational energy

All of these

The force applied on unit area to produce any change in the shape, volume or length of a body is known as

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strain

elasticity

stretching

stress

The SI units of acceleration is

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LT

LT^-1

LT^-2

L²T^-2

A wider objective and the use of blue light of short wavelength produces

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Interference

Diffraction

Less diffraction

Polarization

Due to Plano convex lens and the plane glass plate the thickness of air film changes from the center to outward

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Increasing gradually

Decreasing gradually

It is constant at the centre

None of these

Which of the following quantities has not been expressed in proper units?

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Stress/Strain= Newton/metre²

Surface tension = Newton/metre

Energy = kg m/s

Pressure = newton/metre²

Michelson's interferometer is an instrument used to measure the distance with

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Precision

High precision

Extremely high precision

None of these

Inverse square law for luminace is valid for

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Search light

Isotropic point source

Cylindrical source

All types of source

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