Question # 1

Which of the following changes at an antinode in a stationary wave?

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Density only

Pressure only

Both pressure and density

Neither pressure nor density

When the speed of a body in a fluid increases then the drag force

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decreases

becomes zero

increases

non of them

In a soft iron, domains are

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easily oriented along external field and do not return to original random positions

easily oriented along external field and readily returns to originally random position

do no oriented along external field and also do not returns to originally random position

none of them

Fluids have three types of energies. The Bernoulli's equation combines those energies.which of the following is one of the three enrgies possessed by a fluid?

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potential energy

pressure energy

strain energy

(a) and (b) only

The charge carriers in electrolyte are positive and negative

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protons

electrons

ions

none of these

Watt x second is unit of:

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Force

Work

Power

None of these

The energy required to charge a capacitor of 5μF by connecting D.C. source of 20 KV is

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10 KJ

5 KJ

2 KJ

1 KJ

The ratio of the gravitational force F_gto the electrostatic force F_ebetween two electrons at the same distance apart is approximately

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9.8

24 x 10¹⁹

24 x 10⁴²

24 x 10^-44

Energy is stored in the choke coil in the form of

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Heat

Magnetic energy

Electric energy

Electro-magnetic energy

We can excite an atom by

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Bombardment of particles

Radiating photons

Providing potential difference

All answer are true

The number of vibrating body at any instant from its equilibrium position is called

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displacement

frequency

amplitude

time period

Michelsion devised the Michelson's interferometer in

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1981

1891

1851

1881

The dimensions of displacement is

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[ L ]

[ L²]

[ L³]

None of these

Strain is dimensionless and has

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Units

No units

S.I. units

None of these

The difference between two separated positions are given as X₁ = 10.5 ± 0.1 cm and X₂ = 26.8 ± 0.1 cm. What is their absolute uncertainty

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1.63 ± 0.1 cm

16.3 ± 0.2 cm

3 ± 0.1 cm

16.3 ± 0.05 cm

The least distance of distinct vision for a normal eye is

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15 cm

25 cm

35 cm

1 m

The SI unit gravitational potential is

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Joule/Kg

Kg/joule

Joulex/Kg

Acceleration means the speed of the body is

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Increasing

Decreasing

Just stop

None of these

One horse power in terms of watt is

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7.46

74.6

0.746

746

In a closed organ pipe, the fundamental frequency is f. What will be the ratio of thefrequencies of the next three overtones?

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2 : 3 : 4

3 : 7 : 11

3 : 4 : 5

3 : 5 : 7

For fast moving particles, such as atomic particles in an accelerator, the following branch of physics is applicable

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newtonian mechanics

classical mechanics

relativistic mechanics

all of them

SI unit of potential difference is volt it can be written as

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JC^-2

JC^-1

JC

J.A

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