Previous year MCQs

General science UPPSC 2009 GS-I
Question

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?

Answer & Solution

Answer: (Detailed Solution Below)

Option C: Both (1) and (2)

Detailed Solution:

The correct answer is “Both (1) and (2)”.
1) A jet engine relies on the surrounding air for its oxygen supply. This makes it unsuitable for space travel, where there is no air to breathe.

2) A rocket carries its own supply of oxygen, often in the form of liquid oxygen, along with its fuel. This allows it to operate in space where there is no external atmosphere.

Similar Questions:

Assertion (A): A black hole is an astronomical entity that cannot be seen by telescope.
Reason (R): The gravitational field on a black hole is so strong that it does not allow even light to escape.

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
Match List-I with List-II and select the correct answer by using the codes given below the lists:
List-I List-II

A. LED - 1. 'Bubble boy' Syndrome
B. LCD - 2. Bird disease
C. SARS - 3. Cost-effective light source
D. SCID - 4. Popular and effective mobile screen

Code: A B C D
  1. A) 2 3 1 2
  2. B) 4 3 2 1
  3. C) 1 2 4 3
  4. D) 3 4 2 1
Ozone layer in atmosphere
  1. A) Produces rain
  2. B) Produces pollution
  3. C) Provides safety to life on earth from ultraviolet radiation
  4. D) Produces oxygen in the atmosphere
Which kind of light waves are used in remote control of television:
  1. A) Visible light
  2. B) Infrared
  3. C) X-rays
  4. D) J-rays
Which of the following statements about Bacteria is correct?
  1. A) They are on the border line of living and non-living
  2. B) They are on the border line of plants and animals
  3. C) They are on the border line of flowering and non flowering plants
  4. D) None of the above
Which of the following material is bio-degradable ?
  1. A) Glass bottle
  2. B) Plastic cups
  3. C) Aluminium foil
  4. D) Wool
Which one of the following compounds is used as a sedative?
  1. A) Potassium bromide
  2. B) Calcium chloride
  3. C) Ethyl alcohol
  4. D) Phosphorus trichloride
In electric apparatus 'earth' is used:
  1. A) to reduce the expenditure
  2. B) because the apparatus used 3-phase
  3. C) for safety
  4. D) in the form of fuse
The Ozone layer in the atmosphere:
  1. A) Causes rainfall
  2. B) Creates pollution
  3. C) Protects life on earth from ultraviolet radiation
  4. D) Produces oxygen in the atmosphere
Which one of the following is not an award given on the National Awards Day?
  1. A) Rajiv Khel Ratna
  2. B) Arjun Award
  3. C) Dhyanchand Award
  4. D) Vishwamitra Award
Match List-I with List-II and select the correct answer using the codes given below the lists.
List-I List-II
(Disease) (Cause)

A. Marasmus - 1. Prolonged Starvation
B. Kwashiorkor - 2. Protein Deficiency
C. T.B. - 3. Bacterial Infection
D. Hepatitis B - 4. Viral Infection
  1. A) 1 2 3 4
  2. B) 2 1 3 4
  3. C) 4 2 3 1
  4. D) 2 4 1 3
Assertion (A): Woollen clothes keep us warm.
Reason (R): Wool fibres are made of a particular protein which is a bad conductor of heat.

Select the correct answer using the codes given below:
  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