Previous year MCQs

General science UPPSC 2000 GS-I
Question

When there is a decrease in the concentration of oxygen in the blood, the rate of breathing:

Answer & Solution

Answer: (Detailed Solution Below)

Option B: increases

Detailed Solution:

The correct answer is “increases”.
The answer is: (2) increases.

When the body detects a decrease in blood oxygen concentration (hypoxia), a reflex response triggers an increase in the breathing rate. Faster breathing helps to bring more oxygen into the lungs and expel carbon dioxide, a waste product of cellular respiration.

Similar Questions:

"Pyrheliometer' is used for measuring:
  1. A) Sun spots
  2. B) Air temperature
  3. C) Solar radiation
  4. D) Temperature of plants
The Congress supported the Khilafat Movement mainly for:

1. Reinstatement of Caliph
2. Removal of Caliph
3. Getting the sympathy of the Muslims
4. Marginalising Jinnah in the Congress

Select the correct answer from the codes given below:
Codes:
  1. A) 1 and 3
  2. B) 2 and 4
  3. C) 3 and 4
  4. D) 1 and 4
Given below are two statements, one is labelled as Assertion (A) and the other as Reason (R)

Assertion (A) : Relative humidity decreases with increasing air temperature.
Reason (R) : Absolute humidity increases with increasing evaporation.

Select the correct answer from the codes given below:
  1. A) Both(A) and (R) are true, but (R) is not the correct explanation of(A).
  2. B) (A) is false, but (R) is true
  3. C) Both (A) and (R) are true and (R) is the correct explanation of (A)
  4. D) (A) is true, but (R)is false.
Which one of the following is not property matched?
  1. A) Gene splicing & recombinant DNA technology - Genetic Engineering
  2. B) A diagnostic test to detect the presence or absence or genetic disorders in unborn child - Amniocentesis
  3. C) A process by which living organisms break down complex matter into simpler constituents – Biodegradation
  4. D) An inbuilt time-keeping system in all organisms – Bio-mass
Photo chemical smog always contains
  1. A) Phosphorus
  2. B) Ozone
  3. C) Methane
  4. D) Aluminium ion
Normal temperature of human body is 98.4°F. Its equivalent temperature in °C is:
  1. A) 40.16
  2. B) 36.89
  3. C) 35.72
  4. D) 32.36
Acid rain is caused by:
  1. A) cooling of acid vapours reaching the clouds
  2. B) reaction between rain water and carbon dioxide pollutants
  3. C) reaction between cloud water and sulphur dioxide pollutants
  4. D) reaction between water vapours and electric charge during lightning and cloud hursts
Given below are two statements, one labelled as Assertion (A) and the other as Reason (R).

Assertion (A): Most of the vitamins are not synthesised in human body.
Reason (R): Human organ synthesise only essential micronutrients.

Select the correct answer form the code given below.
  1. A) Both (A) & (R) are true & (R) is correct explanation of (A)
  2. B) Both (A) & (R) are true, but (R) is not correct explanation of (A)
  3. C) (A) is true, but (R) is false.
  4. D) A) is false, but (R) is true.
Ozone protects biosphere from:
  1. A) Infra-red rays
  2. B) Ultraviolet rays
  3. C) X-rays
  4. D) Gama rays
Sodium vapor lamps are used in road lighting because
  1. A) They are cheap
  2. B) Their light is monochromatic and does not scatter when passing through water droplets
  3. C) It's cool for eyes
  4. D) It gives brightness in light
Hydrogen bomb is based on the principle of
  1. A) Controlled fusion reaction
  2. B) Uncontrolled fusion reaction
  3. C) Controlled fission reaction
  4. D) Uncontrolled fission reaction
Which one of the following materials contains calcium?
  1. A) China clay
  2. B) Corundum
  3. C) Gypsum
  4. D) Talc