Question # 1

Three resistors of resistance R each are combined in various ways. Which of the following cannot be obtained?

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3RΩ

2R/4Ω

R/3Ω

2R/3Ω

Which one the following gives three regions of electromagnetic spectrum in order of increasing wavelength?

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Gamma rays, micro waves, visible light

Radio waves, ultraviolet waves, X-rays

Ultraviolet rays, infrared rays, micro waves

Visible light, gamma rays, radio waves

The efficiency of diesel engine is

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25%

25 - 30%

35%

35 - 40%

If the time period a simple pendulum is 2 s, its frequency would be

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2 Hz

1.5 Hz

1.0 Hz

0.5 Hz

The number of translation degress of freedom for a diatomic gas is

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2

3

5

6

For making cooking utensils, which of the following pairs of properties is most suited?

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Low specific heat and high conductivity

Low specific heat and low conductivity

High specific heat and high conductivity

High specific heat and low conductivity

The total charge of any nucleus is given as

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Ze²

Z²e

Z/e

Ze

To make an LED, it is impreacticable to use:

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Silicon

Gallium arsenide

Gallium arsenide phosphide

Iron

Both (B) and (C)

Silicon is one of the mot commonly used:

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onductor

Dielectric

Insulator

Semiconduction

Both (B) and (C)

The short distance between two points direction from its initial point to final point is called:

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Velocity

Displacement

Speed

Distance

When angular acceleration is positive, the body rotates:

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Slower

Slowest

Faster

None of these

How is the interference pattern in Young's double slit experiment affected if the sodium light is replaced by red light of the same intensity

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The fringes will vanish

The fringes will become brighter

The fringes will increase

The fringes will decrease

Which of the following is not true for a crystalline substance

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Shorter range order

Isotropic electrical conductivity

Flat surface

Sharp melting point

A ______ lens is used in the apparatus to get Newton,s rings

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Plano-concave

Plano-convex

Convexo-concave

Double convex

The value of g at the center of earth is:

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Double

Zero

10 time larger than earth

Infinite

Maximum value of solid angle for closed surface is

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2π rad

2π sr

4π sr

360°

On a diffraction grating which thing acts as a slit

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the lines which are ruled on it

the spacing between the lines

either of them

none of them

An atom in which there is a resultant magnetic field, behaves like a tiny magnet and is called as

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magnetic

magnetic dipole

magnetic monopole

none of them

Which of the following is not a perfectly inelastic collision?

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Striking of two glass balls

A bullet striking a bag of sand

An electron captured by a proton

A man jumping onto a moving cart

For full wave rectification, the minimum number of diodes used is:

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1

2

3

4

The atoms molecules or ions in a crystalline solids are at room temperature

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Motionless

Vibrate violently

Fixed

Simply vibrate

The each atom of pure Ge or Si shares neighboring electrons are

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Three

Four

Five

None of these

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