Question # 1

Cosine of an angle is positive in:

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2nd quadrant

3rd quadrant

4th quadrant

All of these

One radian is

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Greater than one degree

Less than one degree

Equal to one degree

None of these

The wave nature of light was proposed by:

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Newton

Thomas Young

Huygen

None of these

The current in microamperes required to produce one millimeter deflection on a scale placed one meter away from the mirror of the galvanometer, defined the sensitivity of

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ammeter

voltmeter

galvanometer

avo-meter

Magnetic lines of force:

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Cannot intersect at all

Intersect at infinity

Intersect within magnet

Intersect at Neutral Point

None of these

The Einstein's changes in length, mass and time are not observed in common life because

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We dont observer then seriously

The masses are too large

Their speed is too small than the speed of right

All of the above

The Instantaneous value of alternative current maybe:

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The same as its RMS value

Greater than its Rms value

The same as its peak value

Any of these

None of these

The SI unit of current is

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watt

coulomb

volt

ampere

By convention, torques producing clockwise rotation are taken as:

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Positive

Nagative

Zero

None of these

A body is moving with constant velocity of 10 m/sec in the north-east direction. Then its acceleration will be:

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10 m/sec²

20 m/sec²

30 m/sec²

Zero

Which one of the following phenomenon cannot be explained on the bases of Huygen's theory

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Refraction

Reflection

Diffraction

Formation of spectrum

In the phenomenon of interference, the bright and dark fringes are of

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Different width

Equal width

Dark fringes are thicker than bright

Nona of these

A string vibrates in 1 loop has frequency 25 Hz if it moves in 2 loops its frequencywould be:

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25 Hz

50 Hz

12.5 Hz

5Hz

The unit cell of the shape of match box is called

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Cubic

Tetragonal

Orthorhombic

Rhomboheral

A new type of optical fibre in which central core has high refractive index and its density gradually decreases towards its periphery is called

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Step index fibre

Multimode step index fibre

Multimode graded index

None of these

Physical quantities having no dimensions are called

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Scalar

Numerics

Non physical Quantities

None of these

If stress is increased beyond the elastic limit a permanent change in the material is observed This behavior is called

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Elastic deformation

Elasticity

Plasticity

Yield strength

The study of properties of fluid at rest is called

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Fluid dynamic

Fluid statics

Both a and b

dynamics

A car travels due east on a level road for 3 km. it then turns the North at an intersection and travels 4 km before stopping.The magnitude of the resultant displacement of car is

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5 km

7 km

1 km

11 cm

If a particle covers half the circle of radius R with constant speed then

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Momentum change is mvr

Change in KE is 1/2 mv²

Change in KE is mv²

Change in KE is zero

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

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9 x 10⁵ V

9 V

8 x 10⁶ V

80 V

Which one of the following is polymer

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Polythene

Polystyrene

Nylon

All

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