MEDIUM
9th CBSE
IMPORTANT
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What do you mean by biological weathering? Give two examples.

Important Questions on Model Test Paper 5

MEDIUM
9th CBSE
IMPORTANT
Science for Ninth Class (Part-3) Biology>Chapter 11 - Model Test Paper 5>SECTION-A>Q 15
Define intercropping. How does it differ with mixed cropping?
HARD
9th CBSE
IMPORTANT
Science for Ninth Class (Part-3) Biology>Chapter 11 - Model Test Paper 5>SECTION-A>Q 16

What is meant by 'diffusion'? Give one example of diffusion in gases.

MEDIUM
9th CBSE
IMPORTANT
Science for Ninth Class (Part-3) Biology>Chapter 11 - Model Test Paper 5>SECTION-A>Q 16
Why do gases diffuse very fast?
MEDIUM
9th CBSE
IMPORTANT
Science for Ninth Class (Part-3) Biology>Chapter 11 - Model Test Paper 5>SECTION-A>Q 16
Name two gases of air which dissolve in water by diffusion. What is the importance of this process in nature?
MEDIUM
9th CBSE
IMPORTANT
Science for Ninth Class (Part-3) Biology>Chapter 11 - Model Test Paper 5>SECTION-A>Q 17
Describe Thomson's model of the atom. Which subatomic particle was not present in Thomson's model of the atom?
HARD
9th CBSE
IMPORTANT
Science for Ninth Class (Part-3) Biology>Chapter 11 - Model Test Paper 5>SECTION-A>Q 17

The mass number of an element is 40. It contains 19 electrons. What is the number of protons and neutrons in it? What is the atomic number of the element? 

MEDIUM
9th CBSE
IMPORTANT
Science for Ninth Class (Part-3) Biology>Chapter 11 - Model Test Paper 5>SECTION-A>Q 18
What do you understand by the kinetic energy of a body?
EASY
9th CBSE
IMPORTANT
Science for Ninth Class (Part-3) Biology>Chapter 11 - Model Test Paper 5>SECTION-A>Q 18
A body is thrown vertically upwards. Its velocity goes on decreasing. What happens to its kinetic energy as its velocity becomes zero?