General science UPPSC 1997 GS-I
Question

Assertion (A): Detergents easily remove oil and dirt from soiled garments.
Reason (R): Detergents increase the surface tension of water.

Answer & Solution

Answer: (Detailed Solution Below)

Option C: A is true but R is false

Detailed Solution:

The correct answer is “A is true but R is false”.

Detergents actually decrease the surface tension of water, not increase it. By reducing the surface tension, detergents allow water to spread more easily and penetrate fabrics, which helps to lift and remove oil and dirt.

Similar Questions:

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. Only A
  2. Only A and B
  3. Only B and C
  4. A, B and C
Which one of the following States elects the largest number of members representing Schedule Tribes to the House of People?
  1. Andhra Pradesh
  2. Bihar
  3. Madhya Pradesh
  4. Maharashtra
Average blood pressure of human being is:
  1. 60/100
  2. 20/80
  3. 60/140
  4. 120/80
Insulin is a type of:
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  2. Enzyme
  3. Vitamin
  4. Salt
Which of the following is found in the composition of vitamin D?
  1. Retinal
  2. Folic acid
  3. Ascorbic acid
  4. Calciferol
Which one of the following gases is used for the purification of drinking water?
  1. Sulphur dioxide
  2. Chlorine
  3. Fluorine
  4. Carbon dioxide
Maximum temperature inside pressure cooker depends on:
  1. Area of hole on die top and weight kept on it
  2. Area of hole on the top and food being cooked
  3. Weight kept on hole at top and food being cooked
  4. Area of hole on the top only
Which of the following statements are correct? Select the correct answer from the codes given below:

1. Femur is the longest bone, in the human body.
2. Cholera is a disease caused by bacteria.
3. "Athletic's" foot is a disease caused by virus.

Codes:
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  2. 1 and 3
  3. 1 and 2
  4. 2 and 3
Which among the following compounds is the main constituent of natural gas ?
  1. Butane
  2. Hexane
  3. Benzene
  4. Methane
What type of electromagnetic radiation is used in the remote control of a television?
  1. Infrared
  2. Ultravoilet
  3. Visible
  4. None of the above
To avoid "knocking" of the engine of a car, which one of the following is used as an anti-knocking agent?
  1. Ethyl alcohol
  2. Butane
  3. Lead Tetra Ethyl
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Who among the following ran "Congress Radio" during the "Quit-India" movement?
  1. Aruna Asaf Ali
  2. Jai Prakash Narayan
  3. Usha Mehta
  4. None of the above