# TNPSC Group 1 Last 10 Years Question Papers with Answers Pdf - 1

Question: 1

Erg × Sec is the unit of

(A) Planck's constant

(B) Angular momentum

(C) Linear momentum

(D) Energy

Ans: A

Planck's constant

Question: 2

When a fluid passes through the constricted art of a pipe, its

(A) Velocity increases and pressure decreases

(B) Velocity decreases and pressure increases

(C) Velocity and pressure increase

(D) Velocity and pressure decrease

Ans: A

Velocity increases and pressure decreases

Question: 3

One fermimetre is equal to

(A) 10-9 m

(B) 10-12 m

(C) 10-15 m

(D) 10-18 m

Ans: C

10-15 m

Question: 4

Rainbow is formed due to a combination of

(A) Refraction and scattering

(B) Dispersion and focusing

(C) Dispersion and total internal reflection

(D) Refraction and absorption

Ans: C

Dispersion and total internal reflection

Question: 5

Which one of the following phenomena is used in optical fibres?

(A) Total internal reflection

(B) Refraction

(C) Successive reflections

(D) Scattering

Ans: A

Total internal reflection

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