Previous year MCQs

General science UPPSC 1994 GS-I
Question

Pencil lead is:

Answer & Solution

Answer: (Detailed Solution Below)

Option A: graphite

Detailed Solution:

The correct answer is “graphite”.
Pencil lead is primarily made of graphite, a form of carbon.

Similar Questions:

What amongst the following is responsible for formation of stone in human kidney?
  1. A) Calcium acetate
  2. B) Calcium oxalate
  3. C) Sodium acetate
  4. D) Sodium Benzoate
A fluorescent tube is preferred to an electric bulb because:
  1. A) It has a larger light emitting surface
  2. B) Voltage fluctuations do not affect it
  3. C) In a tube electrical energy is almost full converted into light.
  4. D) None of the above
Operation "Desert Storm" was the war between:
  1. A) Iraq and Iran
  2. B) Iraq and the Kurds
  3. C) America and its allies against Iraq
  4. D) Iraqis
Assertion (A): Some bacteria can synthesise their own food.
Reason (R): These bacteria have green matter called chloroplasts.

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
The alkaloid caffeine is present in
  1. A) Tea only
  2. B) Coffee only
  3. C) Tea and coffee both
  4. D) Lemon water
Automatic wrist watches get energy from:
  1. A) Cranial spasms
  2. B) Battery
  3. C) From liquid crystal
  4. D) From the various movements of our hands
Given below are two statements, one is labelled as Assertion (A) and the other as Reason (R).

Assertion (A): Maximum number of the species of butterflies are found in tropical countries.
Reason (R): Butterflies can not tolerate low temperatures.

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
The Indian appointed as Chairman of the International Antiwar Organisation in 1988 was:
  1. A) Morarji Desai
  2. B) Rajiv Gandhi
  3. C) Narain Desai
  4. D) Bhulabhai Desai
Which one of the following organic acids is abundant in grapes, tamarind (इमली) and banana?
  1. A) Acetic acid
  2. B) Citric acid
  3. C) Lactic acid
  4. D) Tartaric acid
Which of the following has the highest velocity?
  1. A) Cosmic rays
  2. B) Light
  3. C) Electron
  4. D) Supersonic wave
Consider the following effects of genetic engineering?

1. Disease resistance
2. Growth promotion
3. Animal cloning
4. Human cloning

Of the above, that have been tried with certain amount of success include?
  1. A) 1, 3 and 4
  2. B) 2, 3 and 4
  3. C) 1, 2 and 4
  4. D) 1, 2 and 3
Which of the following statements is not true?
  1. A) Chromosomes are composed of DNA and Protein.
  2. B) Nucleus of a cell does not play a role in cellular reproduction.
  3. C) Chromosomes contain information for inheritance.
  4. D) Functional segment of DNA is called genes.