PHYSICS CH5 Magnetism and Electromagnetism — Science STD 9 — Question

State whether true or false. If false, correct the statement.

A transformer can step up direct current.

• True

• False

Assertion : The production of food from animal sources has increased greatly in the last few decades.
Reason : Operation flood and blue revolution production has increased in recent years.

Assertion: Food can be cooked faster in vessels with copper bottom.

Reason: Copper is the best conductor of heat.

• If both assertion and reason are true and reason is the correct explanation of assertion.

• If both assertion and reason are true but reason is not the correct explanation of assertion.

• If assertion is true but reason is false

• If assertion is false but reason is true.

Assertion (A) : A bird perches on a high power line and nothing happens to the bird.
Reason (R) : The level of the bird is very high from the ground.

Assertion : Porous soil permits both aeration and quick absorption of water.
Reason : The burrowing and soil feeding habits of earthworm make the soil
porous.

Assertion (A) : Heat energy is transferred from one body to another due to a
temperature difference between them.
Reason (R) : Heating a substance causes a rise in temperature.
(a) If both assertion and reason are true and reason is the correct explanation of assertion.
(b) If both assertion and reason are true but reason is not the correct explanation of assertion.
(c) If assertion is true but reason is false.
(d) If assertion is false but reason is true.

(A) : Noble gases are chemically inert in nature. Reason (R) : Noble gases have stable electronic structures.

Assertion (A) : Antiseptic is a substance that prevents infections caused by disease-causing pathogens.
Reason (R) : Antiseptics either kill the microorganism or prevent their growth.

Assertion (A) : The free and open-source software cannot be updated (or) developed to new software.
Reason (R) : Free software is editable and customizable by the user.

Assertion (A) : The skill of estimation is important for all of us in our daily life.
Reason (R) : The skill of estimation reduces our consumption of time.
a) Both A and R are true but R is not the correct reason.
b) Both A and R are true and R is the correct reason.
c) A is true but R is false. ,
d) A is false but R is true.