Question # 1

The motion without consideration of its cause is studied in:

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Kinematics

Mechanics

Statics

Modern Physics

The frequency of the incident light falling on a photosensitive metal plate is doubled the kinetic energy of the emitted photoelectrons is

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Double the earlier value

Unchanged

More than doubled

Less than doubled

The half life of a radio-isotope is 5 years The fraction of atoms decayed in this substance after 15 years will be

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1

3/4

7/8

5/8

A particle moving in a magnetic field has increase in its velocity then its radius of the circle

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Decreases

Increases

Remains the same

Becomes half

A sun rise or sun set, the sun looks reddish because.

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The sun is coldest at these times

Of the effects of reflection and refraction

The sun is hottest at these times

Of the scattering of light

To get a resultant displacement of 10 m, two displacement vectors of magnitude 6 m and 8 m should be combined

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Parallel

Antiparallel

At angle 60°

Perpendicular to each other

Two forces are acting together on an object. The magnitude of their resultant is minimum when the angle between the force is.

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0°

60°

120°

180°

If the metal bob is a simple pendulum is replaced by a wooden bob, then its time period will

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Increase

Decreases

Remain the same

First 'A' then 'B'

A moving charge will gain energy due to the application of

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Electric field

Magnetic

Both of these

None of these

A couple produces

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Purely linear motion

Purely rotational motion

Linear and rotational motion

No motion

A body of mass 2 kg is thrown up vertically with K.E of 490 joules If the acceleration due to gravity is 9.8 m/s² the height at which the K.E of the body becomes half its original value is give by:

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50 m

12.5 m

25 m

10 m

The average binding energy of a nucleus inside an atomic nucleus is about

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8 MeV

8 eV

8 Joules

8 ergs

A 50-volt battery is connected across 10-ohm resistor. The current is 4.5 A. The internal resistance of the battery is

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Zero

0.5 ohm

1.1 ohm

5.0 ohm

Which of the following sources give discrete emission spectrum?

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Incandescent electric bulb

Sun

Mercury vapour lamp

Candle

The contrast in the fringes in any interference pattern depends on

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Fringe width

Intensity ratio of the sources

Distance between the slits

Wavelength

Mechanical waves on the surfaces of a liquid are

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Transverse

Longitudinal

Torsional

both transverse and longitudinal

Which one of the following is a simple harmonic motion?

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Wave moving through a string fixed at both ends

Earth spinning about its own axis

Ball bouncing between two rigid vertical walls

Particle moving in a circle with uniform speed

The henry is the unit for

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Resistance

Magnetic flux

Magnetic field

Inductance

The sum of the magnitude of two forces acting at a point is 18 and the magnitude of their resultant is 12. If the resultant is at 90°with the force of the smaller magnitude, then their magnitudes are:

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3, 15

4, 14

5, 13

6, 12

A particle moves along a circular path under the action of a force. The work done by the force is

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Zero

Positive and non-zero

Negative and non zero

None of the above

In a simple harmonic motion the kinetic energy (KE) and the potential energy (PE), are such that throughout the motion

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KE remains constant

PE remains constant

KE/PE is constant

KE+PE remains constant

The nucleus 6C12 absorbs an energetic neutron and emits a beta particle (β). The resulting nucleus is

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₇N¹⁴

₅B¹³

₇N¹³

₆C¹³

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