Question # 1

A body of weight 1 N has a kinetic energy of 1 joule when its speed is:

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1.46 m sec^-1

2.44 m sec^-1

3.42 m sec^-1

4.43 m sec^-1

The electric potential at the surface of an atomic nucleus (Z = 50) of radius 9.0 x 10^-15is

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9 x 10⁵V

9 V

8 x 10⁶V

80 V

Heating effect of current utilized in:

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Electric motor

Electric toaster

Electroplating

Electric kettle

Both (B) and (D)

A weakly damped system has fairly

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sharp resonance curve

flat resonance curve

both of them

none of them

Energy required by an electron revolving in certain orbit to jump to an excited state is called:

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Ionization energy

Ionization potential

Excitation energy

Excitation potential

None of these

In the forward biases situation, the current flowing across the p-n junction is a few:

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amperes

Milli amperes

Micro amperes

Pico amperes

None of these

When the same object is viewed at a shorter distance, the image on the retina of the eye is _____ the so the object appears:

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Greater, smaller

Smaller, smaller

Smaller, larger

Greater, larger

When certain nucleus emits aβ-particles, is mass number:

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Remain same

Increases by one

Decreases by one

Decreases by four

None of these

The unit of magnetic flux is

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Weber-m²

Weber-m³

Henry

Weber

A process is a reversible process, if the entropy of the system

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increases

decreases

remains constant

none of them

'K' is the proportionality constant of force experienced by conductor. What is the value of 'K' in SI units?

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0

1

0.5

-1

What is the bulk modulus of a material?

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strain/volumetric strain

volumetric stress/strain

stress/volumetric strain

volumetric stress/volumetric strain

The cross product of two perpendicular vectors has magnitude

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Maximum value

Minimum value

Zero

None of these

The refractive index of a medium is defined as a ratio

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A frame of reference stationed on Earth is approximately an example of

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Inertial frame

Non-inertial frame

Every frame

None of these

The momentum of particle is numerically equal to its K.E What is the velocity of the particle

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9 ms^-1

3 ms^-1

2 ms^-1

1 ms^-1

Pressure may be defined as_____per second per unit area:

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Change in force

Change in momentum

Change in energy

Work done

Which will be more effective in knocking a bear down

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A rubber bullet

Lead bullet of same momentum

A wood bullet

None of these

The half-life of a radioactive element which has only 1//32 of its original mass left after a lapse of 60 days is:

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12days

10days

22days

36days

Optical fibres are of

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Five type

Two type

Three type

None of these

The relative permitivity ∈_r for distilled water is

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2.9

1.0008

2.0

2.1

The approximate efficiency of storage battery is

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60%

72%

80%

87%

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