CBSE (Central Board of Secondary Education) Class-7 Science: Questions 56 - 60 of 322

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Question 56

Question MCQ▾

The indigested food from small intestine cannot be absorbed by the blood and is passed to the:

Choices

Choice (4)Response

a.

Large intestine

b.

Anus

c.

Colon

d.

Rectum

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Question 57

Question MCQ▾

Fibres manufactured through chemical processes by man are called as:

Choices

Choice (4)Response

a.

Man-made fibres

b.

Synthetic fibres

c.

Artificial fibres

d.

All a., b. and c. are correct

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Question 58

Question MCQ▾

Prevention taken to prevent tooth decay and for maintaining dental hygiene are:

Choices

Choice (4)Response

a.

Rinse your mouth with saline water after every meal and never put dirty fingers and unwashed object in the mouth

AND

Clean your teeth with a brush and dental floss

b.

Eat food items rich in calcium and phosphorus

c.

Avoid eating sticky and sugary items such as chocolates, sweets and cold drinks

d.

All a., b. and c. are correct

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Question 59

Question MCQ▾

Convection is:

Choices

Choice (4)Response

a.

Mode of transfer of heat in a fluid

b.

In convection the molecules themselves carry heat from hotter region to a colder region

c.

Both a. and b. are correct

d.

Question does not provide sufficient data or is vague

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Question 60

Question MCQ▾

A change whereby only the physical properties of a substance undergo a change is called as:

Choices

Choice (4)Response

a.

Exothermic reaction

b.

Chemical change

c.

Endothermic reaction

d.

Physical change

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