Question # 1

In the equation E=mc²value of c is:

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1,86,000 miles per hour

1,86,000 miles per sec

3 X 10⁸m/sec

Both A and C

Both B and C

The CRO is used for displaying the waveform of a given

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current

voltage

both of them

none of them

One newton is a force that produces an acceleration of 0.5 m/sec²in a body of mass:

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2 kg

3 kg

4 kg

8 kg

Bodies failing freely under gravity provide good example of motion under

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non-uniform acceleration

uniform acceleration

variable acceleration

increasing acceleration

A cube of metal is given a positive charge Q. For the above system, which of the following statements is true?

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Electric potential at the surface of the cube is zero

Electric potential within the cube is zero

Electric filed is normal to the surface of the cube

Electric filed varies within the cube

Velocity of sound in a diatomic as is 300 m/sec. what is its rms velocity?

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400 m/sec

40 m/sec

430 m/sec

300 m/sec

When there is no relative motion between the magnet and coil, the galvanometer indicated

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No current in the circuit

An increasing current

A decreasing current

A constant current

Either B or C

The L-C parallel circuit the capacitor draws a

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leading current

lagging current

main current

none of these

There is present in paraffin a large amount of:

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Nitrogen

Hydrogen

Carbon

Baryllium

Lithium

Conventionally the angular velocity is directed to an angle of:

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90° to the axis of rotation

30° to the axis of rotation

0° to the axis of rotation

None of the above

The SI unit of current is

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watt

coulomb

volt

ampere

The decrease in potential energy of a ball of mass 20 kg which falls from a height 50 cm is:

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968 J

98 J

1980 J

None of these

Plasma physics is the branch of physics deals with the

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Atoms

Molecules

lons

None of these

Certain light of wavelength 600 nm is used to view an object under the microscope. If the aperture of its objective is 1.22 cm, then the limiting angle of resolution will be

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6 x 10^-5rad

7 x 10^-5rad

8 x 10^-5rad

None of these

Intensities of the two waves of light are I and 4I.The maximum intensity of the resultant wave after superposition is

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5I

9I

16I

25I

If C_vdonotes molar specific heat at constant volume and𝜟 T is the change in temperature, then C_v𝜟T gives:

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Volume

Pressure

Energy

Entropy

Shear modulus for water is

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- 4.7

- 3.3

- 1.2

0

Relation between range and maximum range is

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R=R_max Sinθ

R=R_max Sinθ/2

R=R_max Sin2θ

R_max = RSin2θ

How large a force is required to accelerate a body of weight 5 N with 4 ms^-2 is

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10 N

5 N

2 N

1 N

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

The vertical velocity component changes with

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Distance

Time

Height

Angle

Michelson interferometer is based upon

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Interference

Diffraction

Polarization

Reflection

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