Consider the following statements.<br>1. A fibre is an optical system based upon the basic principle of total internal reflection.<br>2. In total internal reflection, the angle of incidence should always be greater than critical angle.<br>3. The critical angle is very low for a light ray coming from diamond to air.<br>Which of the statements given above is/are correct?

A ray of light travels from air to water as shown below. What are ray PQ and ray PR? Ray PQ Ray PR (A) Reflected ray Refracted ray (B) Reflected ray Reflected ray (C) Refracted ray Refracted ray (D) Refracted ray Reflected ray

A

B

C

D

Consider the following statements.
1. Fibre optics is based on the principle of total internal reflection.
2. In an optical fibre communication system, power consumption is extremely low
3. Optical fibre communications are free from radio frequency interference.
4. In India, Reliance Group of Industries is engaged in the manufacture of the optical fibre.
Which of these statements are correct?

A

Only 1, 2 and 3

B

Only 1, 2 and 4

C

Only 1, 3 and 4

D

Only 2, 3 and 4

Each of the question below consists of a question and three statements number I, II and III given below it. You have to decide whether the data provided in the statement are sufficient to answer the question. A bag contains some number of Diamond of 4 different colors (Red, Pink, blue and yellow). What is the total number of Diamond in the bag? I. If 5 Pink Diamond from the bag are replaced by Yellow Diamond, Then the ratio of probabilities of picking 2 yellow Diamond at a time to picking 3 Blue Diamond at a time becomes (1/116). II. The different between probabilities of picking 2 Red Diamonds at a time and probability of picking 2 Blue Diamonds at a time is (23/330). III. If a Diamond is picked from the bag, then there is 40% chance that it is a red Diamond. Probability of picking 2 Red Diamond from the bag is (26/165).

A

The data in only statement I and II together are sufficient to answer the question.

B

The data in only statement I and III together are sufficient to answer the question.

C

The data in only statement III alone is sufficient to answer the question.

D

The data in at least any two of the 3 statements is necessary to answer the question.

E

None of the above

Optical fibre is based on which of the following principles? a. Principle of reflection of light b. Principle of refraction of light c. Principle of total internal reflection d. Principle of dispersion of light

A

a, b and c

B

Only c

C

b and d

D

Only d

Consider the following statements about visible light, UV light and X-ray.
1. The wavelength of visible light is more than that of X-ray.
2. The energy of X-ray photons is higher than that of UV light photons.
3. The energy of UV light photons is less than that of visible light photons.
Which of the statement(s) given above is/are correct?

A

1, 2 and 3

B

1 and 2

C

2 and 3

D

Only 1

Consider the following statements. i) For a perfect reflection, the angle of incidence will be equal to the angle of reflection. ii) The critical angle is the angle of incidence in the denser medium for which the angle of refraction in the rarer medium is 90°. Which of the above statements are true?

A

Both i & ii

B

Only i

C

Only ii

D

None

Consider the following statements: 1. Fiber optics is based on the principle of total internal reflection. 2. In an optical fiber communication system, power consumption is extremely low. 3. In India, Reliance Group of Industries is engaged in the manufacture of optical fiber. 4. Optical fiber communications are free from radio frequency interference. Which of the following statements is/are correct?

A

1, 2 and 3

B

1, 2 and 4

C

Only 1 and 3

D

4 only

E

None of the above/More than one of the above

Consider the following statement: A ray of light passing through the optical centre of a convex lens emerges without any deviation after refraction. A ray of light passing through the first principal focus of a convex lens emerges parallel to the principal axis after refraction. A ray of light passing through the optical centre of a convex lens emerges parallel to the principal axis after refraction. Which one of the following statements INCORRECT?

A

Only 1

B

Only 2

C

Only 3

D

All 1, 2 and 3

An incident ray strikes a plane mirror at an angle of incidence of 50°. What is the decrease in the angle of reflection, if the incident ray moves to angle of incidence of 30°?

A

10°

B

20°

C

30°

D

40°

Low quality of jute fibre is attributed to
1. Discoloration of fibre
2. Very short fibre strands
3. Reduction of cellulose in fibre
4. Reduction of cell wall strength over-retting decreases the fibre quality due to
Select the correct answer:

A

3 and 4

B

1 and 2

C

1 and 4

D

1 and 2

Related Questions