Previous year MCQs

General science UPPSC 1995 GS-I
Question

Red light is used for danger signals because it:

Answer & Solution

Answer: (Detailed Solution Below)

Option A: is scattered least

Detailed Solution:

The correct answer is “is scattered least”.
Red light is used for danger signals because it has the longest wavelength among visible light colors. This means it is scattered the least by atmospheric particles such as fog or rain. As a result, red light can travel farther distances without being significantly reduced in intensity, making it more visible in adverse weather conditions.

Similar Questions:

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
Match List-I and List-II and select the correct answer from the code given below the lists:
List-I - List-II

A. Sour Milk - 1. Malic acid
B. Vinegar and pickle - 2. Carbonic acid
C. Soda water and cold drinks 3. Acetic acid
D. Apple - 4. Lactic acid

Code:
A B C D
  1. A) 1 2 3 4
  2. B) 4 3 1 2
  3. C) 4 3 2 1
  4. D) 3 4 2 1
Consider the following statements and select the correct answer from the code given at the end:

Assert ion (A) :The Constitution of India provides for a federal system.
Reason (R): It has created a very strong centre.

Code:
  1. A) Both (A) and (R) are true and R is 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 (R) is false
  4. D) (A) is false (R) is true
Match List-I and List-II and select the correct answer from the code given below the lists:
List-I (Plant) - List-II (Use)

A. Brahmi - 1. Anti-diabetic
B. Sadabahar - 2. Carminative
C. Pudina - 3. Expectorant
D. Tulsi - 4. Brain Tonic

Code:
A B C D
  1. A) 1 2 3 4
  2. B) 4 1 2 3
  3. C) 3 2 1 4
  4. D) 2 4 3 1
The only vein that carries oxygenated blood is:
  1. A) Pulmonary vein
  2. B) Cystic vein
  3. C) Cardiac vein
  4. D) Hepatic Portal vein
Who among the following visited and studied at Nalanda University:
  1. A) Hiuen Tsang
  2. B) Fahien
  3. C) Magasthenes
  4. D) None of above
The device used for converting alternating current to direct current is called
  1. A) Inverter
  2. B) Rectifier
  3. C) Transformer
  4. D) Transmeter
If a human disease breaks out across a large region of the world, what is it called?
  1. A) Pandemic
  2. B) Epidemic
  3. C) Endemic
  4. D) Epizootic
NAFED is connected with:
  1. A) Animal husbandry
  2. B) Conservation of fuel
  3. C) Agricultural marketing
  4. D) Agricultural implements
Name the Committee which looked into and submitted report about nexus between politicians and criminals:
  1. A) Gyan Prakash Committee
  2. B) Vohra Committee
  3. C) Goswami Committee
  4. D) Rajmannar Conymittee
Which one of the following Noble Gases is not present in air?
  1. A) Helium
  2. B) Argon
  3. C) Radon
  4. D) Neon
Battle that laid the foundation of Muslim power in India was:
  1. A) First Battle of Tarain
  2. B) Second Battle of Tarain
  3. C) First Battle of Panipat
  4. D) Second Battle of Panipat