Red light of wavelength 625 nm is incident normally on an optical diffraction grating with 2 ´ 105 lines/m. Including central principal maxima, how many maxima may be observed on a screen which is far from the grating?

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8

16

15

17

Marie and Pierre Curie invented

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Radio

Radium

Radar

Refrigerator

When resistors are connected in series, their equivalent resistance is given by?

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Product of the individual resistances

Sum of the individual resistances

Sum of reciprocals of the individual resistances

Sum of square of each individual resistances

If a rock is brought from the surface of the moon to the earth, then

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Its mass will change

Its weight will change but not its mass

Both mass and weight will change

Both mass and weight will remain the same

A closed organ pipe and an open organ pipe of same length produce 2 beats/second while vibrating in their fundamental modes. The length of the open organ pipe is halved and that of closed pipe is doubled. Then, the number of beats produced per second while vibrating in the fundamental mode is ______.

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8

7

2

6

According to the Newton’s Universal law of gravitation, “Every body in the universe attracts every other body with a force which is?

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Directly proportional to the distance between them

Directly proportional to the product of their masses

Directly proportional to the product of forces

Directly proportional to the product of their radius

Which instrument is used to measure depth of ocean ?

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Galvanometer

Fluxmeter

Endoscope

Fathometer

Lognitudinal waves and Transverse waves are types of ?

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Mechanical waves

Non-Mechanical waves

Both of above

None of Above

On a cold day when a room temperature is 15oC, the metallic cap of a pen becomes much colder than its plastic body, though both are at the same temperature of 15oC, because

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Metals have higher thermal capacity than plastics

Plastics have a lower density than metals

Metals are good conductor of heat

Plastics have a higher thermal conductivity than metals

Which instrument is used to measure the scattering of light by particles suspended in a liquid ?

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Nephetometer

Ohmmeter

Ondometer

Pyrometer

The motion of a projectile follows a?

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Vertical path

Spinning path

Curved path

Straight path

The apparent weight of a person standing in a elevator which is moving down with uniform acceleration will be?

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Same as the weight on the surface of the earth

Greater than its weight on the surface of the earth

Less than its weight on the surface of the earth

Twice the weight of on the surface of the earth

Radian per second is unit of

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Momentum

Moment of Inertia

Frequency

Angle Velocity

If alpha, beta and gamma rays carry same momentum, which has the longest wavelength?

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Alpha rays

Beta rays

Gamma rays

None, all have same wavelength

Consider the following statements:
1. If magenta and yellow-coloured circles intersect, the intersected area will have red colour.
2. If cyan and magenta coloured circles intersect, the intersected area will have blue colour.
Which of the statement(s) given above is/are correct?

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1 only

2 only

Both 1 and 2

Neither 1 nor 2

A dry cell supplies?

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Both alternating and direct current

Alternating current

Direct current

None of above

The dimensions of universal gravitational constant are

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M2 L2 T-2

M-1 L3 T-2

M L2 T-2

M L-1 T-2

A 20 cm length of a certain solution causes right handed rotation of 38°. A 30 cm length of another solution causes left handed rotation of 24°. The optical rotation caused by 30 cm length of a mixture of the above solutions in the volume ratio 1 : 2 is

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Right handed rotation of 3°

Left handed rotation of 3°

Right handed rotation of 14°

Left handed rotation of 14°

in 1666, Newton concluded that the force which caused an apple to fall to the ground and the force that kept the moon in its orbit around the earth is the ?

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Weight called as “Weightlessness

Acceleration called as “Centripetal acceleration”

Universal force called as “Gravitation”

Universal force called as “Artificial Gravity”

A In Young's double slit experiment if monochromatic light used is replaced by white light, then _______.

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All bright fringes become white

All bright fringes have colours between violet and red

No fringes are observed

Only central fringe is white, all other fringes are coloured

A wire of 50 cm long and 1 mm² in cross-sectional area carries a current 4A when connected to a 2V battery. The resistivity of the wire is

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2 x 10 -7 Ωm

5 x 10 -7 Ωm

4 x 10 -6 Ωm

1 x 10 -6 Ωm

Atom is the smallest part of matter which takes part in chemical reactions.

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1

One should not connect a number of electrical appliances to the same power socket because

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This can damage the appliances due to overloading

This can damage the domestic wiring due to overloading

This can damage the electrical meter

The appliance will not get full voltage

In a common emitter amplifier circuit using an n-p-n transistor, the phase difference between the input and the output voltages will be :

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135

180°

45°

90°

Consider the following statements. Work is not done, when:
1. a man is walking on a horizontal road.
2. a man is climbing up a hill.
3. a man with a load on his head is walking on a horizontal road.
4. moon is revolving round the earth.
Which of the statements given above are correct?

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1 and 3 only

1 and 4 only

2, 3 and 4

1, 3 and 4

The force which opposes the relative motion between different layers of liquid or gases is called

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Critical Velocity

Streamline Flow

Terminal Velocity

Viscous Force

A copper ball of mass 100 gm is at a temperature T. It is dropped in a copper calorimeter of mass 100 gm, filled with 170 gm of water at room temperature. Subsequently, the temperature of the system is found to be 75°C. T is given by : (Given : room temperature = 30° C, specific heat of copper = 0.1 cal/gm°C

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1250°C

825°C

800°C

885°C

Out of the following pairs, which one does not have identical dimension?

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Moment of inertia and moment of a force

Work and Torque

Angular momentum and Planck's constant

Impulse and Momentum

Let a thin capillary tube be replaced with another tube of insufficient length then, we find water

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Will overflow

Will not rise

Depressed

Change its meniscus

Minimum number of unequal vectors which can give zero resultant are

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Two

Three

Four

More than four

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