Question # 1

A planet is observed by an astronomical refracting telescope having an objective of focal length 16 m and an eyepiece of focal length 2 cm.

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The distance between the objective and the eyepiece is 8 m

The angular magnification of the planet is 200

The image of the planet is inverted

The objective is smaller than the eyepiece

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

To explain his theory Bohr used

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Conservation of linear momentum

Conservation of angular momentum

Conservation of quantum frequency

Conservation of energy

When sound waves travel from air to water which of these remains constant?

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Velocity

Frequency

Wavelength

All the above

Planck's constant has the dimensions of:

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Energy

Momentum

Frequency

Angular momentum

An object is placed at a distance of f/2 from a convex lens. The image will be

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At one of the foci, virtual and double its size

At, 3f/2, real and inverted

At 2f, virtual and erect

At f, real and inverted

The magnetic moment of a circular coil carrying current is

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Directly proportional to the length of the wire in the coil

Inversely proportional to the length of the wire in the coil

Directly proportional to the square of the length of the wire in the coil

Inversely proportional to the square of the length of the wire in the coil

Blood has a density

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Equal to water

Greater then water

Lesser then water

None of these

A force of 10N is acting along y-axis. Its component along x-axis is

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10N

20N

100N

Zero N

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

With the propagation of a longitudinal wave through a material medium, the quantities transmitted in the propagation direction are

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Energy, momentum and mass

Energy

Energy and mass

Energy and linear momentum

When a hydrogen atom is bombarded, the atom is excited to the n = 4 state of hydrogen atom. The energy released when the atom falls from n = 4 state to the ground state is

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1.275 eV

12.75 eV

5 eV

8 eV

The incorrect statement regarding the lines of force of the magnetic field B is

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Magnetic intensity is a measure of lines of force passing through unit area held normal to it

Magnetic lines of force form a close curve

Inside a magnet, its magnetic lines of force move from north pole of a magnet towards its south pole

Due to a magnet magnetic lines of force never cut each other

Two electric bulbs of 200 W and 100 W have same voltage. If R₁and R₂be their resistance respectively then

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R₁=2R₂

R₂=2R₁

R₂=4R₁

R₁=4R₂

Which of the following sources give discrete emission spectrum?

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Incandescent electric bulb

Sun

Mercury vapour lamp

Candle

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