Question # 1

The acceleration 'a' in m/s² of a particle is given by a = 3 t² + 2 t + 2,where 't' is the time if the particle starts out with a velocity v = 2 m/s at t = 0, then the velocity at the end of 2 second is

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12 m/s

24 m/s

18 m/s

36 m/s

A p-n junction has a thickness of the order of

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1 cm

1 mm

10^-6 cm

10^-12 cm

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

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Ultraviolet

Infra red

Visible

X-ray

In a Millikan's oil drop experiment the charge on an oil drop is calculated to be 6.35 x 10-19 C. The number of excess electrons on the drop is

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3.9

4

4.2

6

Energy is stored in the choke coil in the form of

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Heat

Magnetic energy

Electric energy

Electro -magnetic energy

A piece of fuse wire melts when a current of 15 ampere flows through it.With this current, if it dissipates 22.5 W. the resistance of fuse wire will be

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Zero

10 Ω

1 Ω

0.10 Ω

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

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Young's modulus

Bulk modulus

Modulus of rigidity

None of the above

A prism splits a beam of white light into its seven constituent colors this is so because

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Phase of different colors is different

Amplitude of different colors is different

Energy of different colors is different

Velocity of different colors is different

Which of the following is equal to:

joule x ohm / volt x second ?

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Ampere

Volt

Watt

Tesla

Two bodies with masses M_A and M_B are moving with equal kinetic energy.Their linear moments are numerically in a ratio | P_A| : |P_B| will be:

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M_B: M_A

M_A: M_B

√M_A : √M_B

M_A²: M_B²

The motion without consideration of its cause is studied in:

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Kinematics

Mechanics

Statics

Modern Physics

If 2.2 kilowatt power is transmitted through a 10 ohm line at 22000 volt, the power loss in the form of heat will be

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0.1 watt

1 watt

10 watt

100 watt

Ultra-violet radiation of 6.2 eV falls on an aluminium surface. K.E. of fastest electron emitted is (Work function = 4.2 eV)

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3.2 x 10-21 J

3.2 x 10-19 J

7 x 10-25 J

9 x 10-32 J

According to the Hooke's law the force required to change the length of a wire by 'I' is proportional to

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I^-2

I^-1

I

I²

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

The unit of inductance is equivalent to

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V x s/A

V x A/s

A x s/v

V/A x s

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

What remains constant in the field of central force?

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Potential energy

Kinetic energy

Angular momentum

Linear momentum

The percentage errors in the measurements of mass and speed are 2% and 3% respectively. How much will be the maximum error in the estimate of the kinetic energy obtained by measuring mass and speed

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11%

8%

5%

1%

The motion without consideration of its cause is studied in

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Kinematics

Mechanics

Statics

Modern Physics

A cable that can support a load W is cut into two equal parts. The maximum load that can be supported by either part is:

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W/4

W/2

W

2W

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