Question # 1

Astrophysics is a branch of physics, which deals with:

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Sub-atomic particles

Stars and galaxies

Light and sound

Music

The graph showing the variation of displacement with time is a

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Sine curve

Straight line

Parabola

None of these

Different radioactive material have

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same half lives

different half lives

same mean lives

same total lives

The value of electrical constant of proportionality k is

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9 x 10⁹Nm²C^-2

9 x 10^-9Nm²C^-2

9 x 10¹⁰Nm²C²

9.85 x 10^-12N^-1C^-2

A spring of constant k = 0.4 N m^-1is to be extended through 10 cm at a place where g = 10 m sec^-2. The mass to be suspended should be:

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4 gms

0.4 gm

40 gms

None of these

In case of an ideal gas, the P.E associated with its molecule is

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maximum

zero

minimum

not fixed

One torr is equal to

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13.33 N/m²

760 N/m²

760 mm Hg

133.3 N/m²

Work has a dimension as that of:

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Torque

Angular momentum

Linear momentum

Power

Xerography means:

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Dry writing

Wet writing

Poor writing

Excellent writing

Both (A) and (B)

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

Such an inductor coil which does not consume energy and is often employed for controlling a.c. without consumption of energy is called

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Choke

impedance

Semi-conductor

None

Bats navigate and find food by:

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Ultrasonic

Echolocation

Refraction

Electric potential of earth is taken to be because earth is a good

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insulator

Conductor

Semi-conductor

Dielectric

When a silicon crystal is doped with a trivalent element, such an extrinsic semi-conductor is called

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p-type semi-conductor

n-type semi-conductor

either of them

none of them

Two particles of equal masses are revolving in circular paths of radii r₁ and r₂respectively with the same speed The ratio of their centripetal force

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r₂/r₁

√(r₂/r₁)

(r₂/r₁)

(r₂/r₁)²

On a rainy day if there is an oil drop on tar road colored rings are seen around this drop This is because of

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Interference pattern produced due to thin oil film

Diffraction pattern

Polarization

Total internal reflection of light

Fringe spacing in YDS experiment will be maximum if we use:

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Red light

Green light

Violet light

Blue light

In Milikan's oil drop experiment, the drag force on oil drop is

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F_D = 6ηrv_t

F_D = 6πηrv_t²

FD = 6πηr²v_t

FD = 6πηrv_t

Universal gas constant has the unit of

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Newton/°C

Newton/K

J/mol K

Watt/kelvin

Shear modulus for diamond is

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156

353

450

477

The magnitude of displacement is

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Distance between the two points

Distance in a curved path

Shortest distance between two points

None of these

Name of projectile is the same for the following pair of angles:

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0° and 45°

35° and 55°

15° and 60°

30° and 75°

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