Previous year MCQs

General science UPPSC 2005 GS-I
Question

The rain-drops are spherical because:

Answer & Solution

Answer: (Detailed Solution Below)

Option C: the water has surface tension

Detailed Solution:

The correct answer is “the water has surface tension”.
The raindrops are spherical primarily due to (3) the water's surface tension. Surface tension causes water molecules to be attracted to each other, resulting in the spherical shape of small droplets.

Similar Questions:

Which hormone is known as "fight or flight" hormone:
  1. A) Insulin
  2. B) Adrenaline
  3. C) Estrogen
  4. D) Oxytocin
The leaning tower of Pisa does not fall because:
  1. A) it is tapered at the top
  2. B) it covers a large base area
  3. C) its centre of gravity remains at the lowest position
  4. D) the vertical line through the centre of gravity of the tower falls within the base
Assertion (A): The atmosphere receives most of the heat only indirectly from the sun and directly from the earth's surface.
Reason (R): The conversion from shortwave solar to long-wave terrestrial energy takes place at the earth's surface.

Code:
  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
The highest decadal growth rate in sex ratio during 1991-2001 2001-2011 has been recorded by:
  1. A) Arunachal Pradesh
  2. B) Uttaranchal
  3. C) Kerala
  4. D) Andaman and Nicobar Islands
Consider the following statements about haemoglobin:

1) It carries oxygen in the blood.
2) It is iron containing compound.
3) It provides immunity against certain disease.
4) It imparts red colour to the blood.

The correct statements out of these are:
  1. A) 1,2 and 3
  2. B) 2, 3 and 4
  3. C) 1, 3 and 4
  4. D) 1, 2 and 4
Double-helical structure of DNA was given by whom ?
  1. A) Jacob and Monod
  2. B) Watson and Crick
  3. C) H.G. Khorana
  4. D) None of the above
The cells which have the capacity to divide and differentiate into any type of cells in the body are the focus of research of several serious diseases are:
  1. A) Bud cells
  2. B) Red cells
  3. C) Mesangial cells
  4. D) Stem cells
Match List - I with List - II and select the correct answer from the codes given below:

List - I - List-II
A. Vitamin B12 - 1. Magnesium
B. Haemoglobin - 2. Cobalt
C. Chlorophyll - 3. Copper
D. Brass - 4. Iron

Codes:
A B C D
  1. A) 2 4 1 3
  2. B) 2 1 3 4
  3. C) 4 1 2 3
  4. D) 3 4 2 1
Ripening hormone is:
  1. A) Gibberellin
  2. B) Morphactin
  3. C) Ethylene
  4. D) I.B.A.
Which one of the following is a secretion from the body of an insect?
  1. A) Pearl
  2. B) Coral
  3. C) Lac
  4. D) Gum
Jhuming is practised mostly in
  1. A) Assam
  2. B) Andhra Pradesh
  3. C) Nagaland
  4. D) Madhya Pradesh
The first disciple of Lord Mahavir was
  1. A) Jamali
  2. B) Yosuda
  3. C) Bipin
  4. D) Prabhash