Previous year MCQs

General science UPPSC 2009 GS-I
Question

Which of the following laser types is used in a laser printer?

Answer & Solution

Answer: (Detailed Solution Below)

Option B: Semiconductor laser

Detailed Solution:

The correct answer is “Semiconductor laser”.
Semiconductor lasers, also known as laser diodes or injection lasers, are the most common type of laser used in laser printers.

Similar Questions:

Identify the district in U.P. which has not been selected for Sodic Land Reclamation Project-II funded by World Bank.
  1. A) Allahabad
  2. B) Aligarh
  3. C) Sitapur
  4. D) Rae Bareilly
Apart from quinine, which one of the following herbal drug is used to cure malaria?
  1. A) Arteether
  2. B) Glace
  3. C) Lutivit
  4. D) Cineraria
Aruna Asaf Ali was connected with which one of the following movements as a woman organiser of underground activity?
  1. A) Civil Disobedience Movement
  2. B) Non-Cooperation Movement
  3. C) Quit India Movement
  4. D) Swadeshi Movement
We obtain turmeric from which part of the plant?
  1. A) Stem
  2. B) Root
  3. C) Fruit
  4. D) Flower
Television viewers using dish antenna to receive satellite signals do not receive signals during rain because:

(A) Of the small size of the antenna.
(B) Rain droplets absorb the energy of radio waves.
(C) Rain droplets disperse the energy of radio waves from their original direction.

Which of the above statements are correct?
  1. A) Only A
  2. B) Only A and B
  3. C) Only B and C
  4. D) A, B and C
Consider the following statements in respect of a jet engine and a rocket:

1) A jet engine uses the surrounding air for it oxygen supply and so is unsuitable for motion in space.
2) A rocket carries its own supply of oxygen in the gas form as fuel.

Which of the above statements is/are correct?
  1. A) (1) only
  2. B) (2) only
  3. C) Both (1) and (2)
  4. D) Neither (1) nor (2)
The Black Hole Theory was propounded by:
  1. A) CV Raman
  2. B) H.J Bhabha
  3. C) S. Chandrashekhar
  4. D) Hargovind Khurana
Dinosaurs were:
  1. A) Cenozoic reptiles
  2. B) Mesozoic birds
  3. C) Palaeozoic amphibia
  4. D) Mesozoic reptiles
Consider the following statements:

Assertion (A): If Ice collects on the freeze the cooling in the refrigerator is affected adversely.
Reason (R) : Ice is a poor conductor.

Select the correct answer using the codes given below:
Codes:
  1. A) Both (A) and (R) are true and (R) is the correct explanation of (A).
  2. B) Both (A) and (R) are true, but (R) is not the correct explanation of (A).
  3. C) (A) is true, but (R) is false.
  4. D) (A) is false, but (R) is true.
Which of the following air pollution gets dissolve in haemoglobin of the blood more rapidly than oxygen?
  1. A) PAN
  2. B) Carbon dioxide
  3. C) Carbon monoxide
  4. D) Ozone
Consider the following statements about the Preamble of the Constitution and state which of them are correct with the help of given codes:

1. The objective resolution proposed by Pt. Nehru Ultimately became the Preamble.
2. It is not justiciable in nature.
3. It cannot be amended.
4. It cannot override the specific provisions of the Constitution.
  1. A) Only 1 and 2
  2. B) Only 1,2 and 4
  3. C) Only 1,2 and 3
  4. D) Only 2, 3 and 4
Which one of the following pairs is not correctly matched?
  1. A) Y2K - Computer
  2. B) Arthritis - Uric Acid
  3. C) Noise pollution - Decibel
  4. D) Param 10,000 - Land to land missile