TS Polycet (Polytechnic) 2016 Previous Question Paper with Answers And Model Papers With Complete Analysis

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61) A person is not feeling hot or cold with surroundings. Then he is in the state of

A) thermal equilibrium

B) high temperature

C) low temperature

D) both high and low temperatures

View Answer

A) thermal equilibrium
62) x g of water is heated from y°C to z°C. The quantity of heat required in calories is

A) X(y/z)

B) X(z/y)

C) X(Z-y)

D) X(z+y)

View Answer

C) X(Z-y)
63) During phase change of a substance

A) temperature remains constant

B) temperature increases

C) temperature decreases

D) temperature may increase or decrease

View Answer

A) temperature remains constant
64) When parallel rays are incident on a concave mirror, at what point do they meet after reflection?

A) Centre of curvature

B) Focus

C) Pole

D) Infinity

View Answer

B) Focus
65) Which of the following relations is correct in general for spherical mirrors with object distance u, image distance v and focal length f?

A) -1/f =1/u+1/v

B) 1/f =1/u+1/v

C) 1/f =1/u x 1/v

D) 1/f x 1/u =1/v

View Answer

B) 1/f =1/u+1/v
66) An object is placed between pole and focus of a concave mirror. The nature of the image is

A) real, inverted and diminished

B) real, inverted and same size

C) virtual, erect and enlarged

D) virtual,- erect and diminished

View Answer

C) virtual, erect and enlarged
67) If speed of light in medium 1 is V1 and in medium 2 is v2, then the refractive index of second medium with respect to first medium is

A) n 12 =v 1 /v 2

B) n 21 = v 2 / v 1

C) n 21 = v 1 / v 2

D) n 12 =v 2 /v 1

View Answer

C) n 21 = v 1 / v 2
68) The main principle behind working of optical fibers is

A) total internal reflection

B) dispersion

C) refraction

D) reflection

View Answer

A) total internal reflection
69) The formula for refractive index (n) of a prism having angle of prism A and angle of minimum deviation D is

A) n = \frac{\sin\left({\displaystyle\frac{A-D}2}\right)}{\sin\left({\displaystyle\frac A2}\right)}

B) n = \frac{\sin\left({\displaystyle\frac A2}\right)}{\sin\left({\displaystyle\frac{A-D}2}\right)}

C) n = \frac{\sin\left(A\right)}{\sin\left({\displaystyle\frac{A+D}2}\right)}

D) n = \frac{\sin\left({\displaystyle\frac{A+D}2}\right)}{\sin\left({\displaystyle\frac A2}\right)}

View Answer

D) n = \frac{\sin\left({\displaystyle\frac{A+D}2}\right)}{\sin\left({\displaystyle\frac A2}\right)}
70) What happens to refractive index of a medium when wavelength of incident light ray increases?

A) Decreases

B) Increases

C) Becomes zero

D) Becomes infinity

View Answer

A) Decreases
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