018/2023 - Station Officer (Trainee)

Question 1

The dimension of coefficient of viscosity is

Accepted Answer

ML⁻¹T⁻¹

Answer

MLT⁻¹

Answer

ML⁻¹T

Answer

ML⁻¹T⁻²

Question 2

The radioactive element Neptunium (₉₃Np²³⁹) emits which particle to form Plutonium

Accepted Answer

β particle

Answer

α particle

Answer

γ particle

Answer

positron

Question 3

Which of the following is true in the case of hexagonal crystal systems ?

Accepted Answer

a = b ≠ c, α = β = 90°, γ = 120°

Answer

a = b = c, α = β = γ ≠ 90°

Answer

a ≠ b ≠ c, α ≠ β ≠ γ ≠ 90°

Answer

a ≠ b ≠ c, α = β = 90°≠ γ

Question 4

In the case of L – S coupling scheme when L > S, J can have

Accepted Answer

(2S + 1) values

Answer

(2S + L) values

Answer

(2L + 1) values

Answer

(2L + S) values

Question 5

Lyman spectral series of hydrogen atom lies in which region of the electromagnetic spectrum ?

Accepted Answer

Ultraviolet region

Answer

Infra-Red region

Answer

Visible region

Answer

Radio waves

Question 6

Which of the following are not the conditions to produce Haidinger fringes ?
i. The source must be an extended source.
ii. The source must be a narrow source.
iii. The film thickness must be appreciably large.
iv. The film thickness must be very small.
v. The observing instrument is to be focused for parallel rays.

Accepted Answer

Only (ii and iv)

Answer

Only (i, iii and iv)

Answer

Only (ii, iv and v)

Answer

Only (iv and v)

Question 7

Which of the following statements are correct in accordance with the first law of Thermodynamics ?
i. It is applicable to any process by which a system undergoes a physical change.
ii. It is applicable to any process by which a system undergoes a chemical change .
iii. It introduces the concept of internal energy.
iv. It does not provide a method for determining the change in internal energy.

Accepted Answer

i, ii and iii

Answer

i, iii and iv

Answer

i, ii and iv

Answer

ii, iii and iv

Question 8

The angle of contact depends on
i. The nature of the liquid.
ii. The solid with which it is in contact.
iii. The purity of solid and liquid.
iv. Nature of the vapour.

Accepted Answer

i, ii, iii and iv

Answer

i, ii and iii

Answer

ii, iii and iv

Answer

i, iii and iv

Question 9

Which of the following is the relation between numerical aperture and acceptance angle in the case of optical fibre communication ? Symbols have the usual meaning

Accepted Answer

Sinθ₀ = n₀⁻¹(n²₁ – n²₂)¹/²

Answer

Sinθ₀ = n₀(n²₁ – n²₂)¹/²

Answer

Sinθ₀ = n₀⁻¹(n²₁ – n²₂)²

Answer

n₀⁻¹ Sinθ₀ = (n²₁ – n²₂)¹/²

Question 10

In Fraunhoffer single slit diffraction pattern, a screen is placed 1m away from the lens to obtain the pattern. Which is the wavelength of light if the slit width is 0.2 mm and the first minima lie 2.5 mm on either side of the central maximum ?

Accepted Answer

5000 Å

Answer

4500 Å

Answer

5500 Å

Answer

4000 Å

Question 11

A Carnot’s engine working between 127°C and 27°C absorbs 60 cals of heat. How much heat is rejected ?

Accepted Answer

45 cals

Answer

65 cals

Answer

35 cals

Answer

25 cals

Question 12

What is the ratio of extension produced in the wires of the same material, subjected to a force in the ratio of 4 : 1 and their lengths and radius are in the ratio of 1 : 16 and 1 : 4 respectively ?

Accepted Answer

1 : 1

Answer

2 : 1

Answer

1 : 2

Answer

1 : 4

Question 13

The correct order of bond angles in NH₃, PH₃, AsH₃ and SbH₃ is

Accepted Answer

NH₃ > PH₃ > AsH₃ > SbH₃

Answer

PH₃ > NH₃ > AsH₃ > SbH₃

Answer

SbH₃ > AsH₃ > PH₃ > NH₃

Answer

AsH₃ > SbH₃ > PH₃ > NH₃

Question 14

Choose the correct answer with respect to the measurement of hardness of water by complexometric titration, carried out using Eriochrome black as indicator in a buffered solution of pH around 10.

Accepted Answer

Magnesium-EDTA complex is more stable than the magnesium-indicator complex

Answer

Magnesium-indicator complex is more stable than magnesium-EDTA complex

Answer

At the end point, the colour changes from blue to red

Answer

At the end point, colour of the solution is due to the mg-indicator complex

Question 15

The number of radial nodes present in 4Px orbital is

Accepted Answer

2

Answer

4

Answer

3

Answer

1

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018/2023 - Station Officer (Trainee)