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Science - Class 6
ScienceClass 6

Science

Basic science concepts for Class 6

Previous Year Questions

Practice questions from Science Science

1

Which of the following is/are the example/examples of chemical change?

  1. Crystallization of sodium chloride
  2. Melting of ice
  3. Souring of milk

Select the correct answer using the code given below.

A. 1 and 2 only
B. 3 only(Correct Answer)
C. 1, 2 and 3
D. None

Crystallization of sodium chloride and melting of ice are physical changes as they involve a change of state. Souring of milk is a chemical change because it results in the formation of new substances.

Source: 7th NCERT: Science Chapter

2

Consider the following pairs:

VitaminDeficiency Disease
Vitamin CScurvy
Vitamin DRickets
Vitamin ENight blindness

Which of the pairs given above is/are correctly matched?

A. 1 and 2 only(Correct Answer)
B. 3 only
C. 1, 2 and 3
D. None

Vitamin A causes Night Blindness.

Source: NCERT: Class 9 Science

3

In a pressure cooker, the temperature at which the food is cooked depends mainly upon which of the following?

  1. Area of the hole in the lid
  2. Temperature of the flame
  3. Weight of the lid

Select the correct answer using the code given below.

A. 1 and 2 only
B. 2 and 3 only
C. 1 and 3 only(Correct Answer)
D. 1, 2 and 3

Inside a pressure cooker, the boiling point is increased by increasing the pressure. Hence, cooking is faster. Therefore, the temperature at which food is cooked is affected by the pressure and not the temperature of the flame.

This can also be understood by understanding why cooking is difficult on hills. At high altitudes, atmospheric pressure is lower, reducing the boiling point of water as compared to that at sea level.

Source: NCERT

4

Rainbow is produced when sunlight falls on drops of rain. Which of the following physical phenomena are responsible for this?

  1. Dispersion
  2. Refraction
  3. Internal reflection

Select the correct answer using the codes given below:

A. 1 and 2 only
B. 2 and 3 only
C. 1 and 3 only
D. 1, 2 and 3(Correct Answer)

Option 1: Each individual droplet of water acts as a tiny prism that both disperses the light and reflects it back to our eye.

Option 2: Since water is more dense than air, light is refracted as it enters the drop.

Option 3: Some of the light will reflect off the back of the drop if the angle is larger than the critical angle (48° for water).

Source: NCERT: Class X Science

5

Lichens, which are capable of initiating ecological succession even on a bare rock, are actually a symbiotic association of

A. algae and bacteria
B. algae and fungi(Correct Answer)
C. bacteria and fungi
D. fungi and mosses

Lichens represent an intimate mutualistic relationship between a fungus and photosynthesising algae or cyanobacteria.

Source: 12th NCERT: Biology Unit 10 Chapter 13

Previous Year Questions

Test your knowledge with these practice questions

Question 1 of 50 / 5 answered
1

Which of the following is/are the example/examples of chemical change?

  1. Crystallization of sodium chloride
  2. Melting of ice
  3. Souring of milk

Select the correct answer using the code given below.

Year: 2014

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