Question # 1

Centre of mass is a point

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Which is geometric centre of a body

From which distance of particles are same

Where the whole mass of the body is supposed to be centered

Which is the origin of reference frame

In which region of electromagnetic spectrum does the Lyman series of hydrogen atom lie

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Ultraviolet

Infrared

Visible

X-ray

When boron is added as an impurity to silicon, the resulting material is.

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n type conductor

n type semiconductor

p-type conductor

p-type semiconductor

A 50-volt battery is connected across 10-ohm resistor. The current is 4.5 A. The internal resistance of the battery is

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Zero

0.5 ohm

1.1 ohm

5.0 ohm

In which case application of angular velocity is useful?

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When a body is rotating

When velocity of body is in a straight line

When velocity is in a straight line

None of these

In a voltmeter the conduction takes place due to

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Electrons only

Holes only

Electrons and holes

Electrons and ions

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

The product of the pressure and volume of an ideal gas is

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A constant

Approximately equal to the universal gas constant

Directly proportional to its temperature

Inversely proportional to its temperature

Electrons in the atom are held in the atom due to

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Coulomb forces

Nuclear forces

Gravitational forces

Van der Waal's forces

Which of the following is not thermo dynamical function?

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Enthalpy

Work done

Gibb's energy

Internal energy

At constant volume temperature is increased. Then

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Collision on walls will be less

Number of collisions per unit time will increase

Collisions will be in straight lines

Collisions will not change

Which of the modulus of elasticity is involved in compression a rod to decrease its length?

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Young's modulus

Bulk modulus

Modulus of rigidity

None of the above

Shunt required in an ammeter of resistance R to decrease its deflection from 30 ampere to 10 ampere is

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R/4

R/3

R/2

R

According to classical theory the proposed circular path of an electron in Rutherford model of atom will be

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Circular

Straight line

Parabolic

Spiral

If tube length of astronomical telescope is 105 cm and magnifying power is 20 for normal setting. Calculate the focal length of objective

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100 cm

10 cm

20 cm

25 cm

At a certain instant a stationary transverse wave is found to have maximum kinetic energy. The appearance of string of that instant is:

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Sinusoidal shape with amplitude A/3

Sinusoidal shape with amplitude A/2

Sinusoidal shape with amplitude A

Straight line

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