CBSE Class-7 Science: Questions 55 - 60 of 322

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Question number: 55

» Acids, Bases and Salts » Neutralization » Phenolphthalein

MCQ▾

Question

Phenolphthalein is colourless in water but changes to pink colour when added to a:

Choices

Choice (4) Response

a.

Base

b.

Salt

c.

Acid

d.

All of the above

Question number: 56

» Nutrition in Animals » The Food Pipe & Stomach » Large Intestine

MCQ▾

Question

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

Choices

Choice (4) Response

a.

Anus

b.

Large intestine

c.

Colon

d.

Rectum

Question number: 57

» Fibre to Fabric » Fibre » Natural and Man-Made Fibres

MCQ▾

Question

Fibres manufactured through chemical processes by man are called as:

Choices

Choice (4) Response

a.

Synthetic fibres

b.

Man-made fibres

c.

Artificial fibres

d.

All a. , b. and c. are correct

Question number: 58

» Nutrition in Animals » Mouth and Buccal Cavity » Tooth Decay

MCQ▾

Question

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

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

b.

Clean your teeth with a brush and dental floss

c.

Eat food items rich in calcium and phosphorus

d.

All a. , b. and c. are correct

Question number: 59

» Heat » Transfer of Heat » Convection

MCQ▾

Question

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

Question number: 60

» Physical and Chemical Changes » Physical Changes » Introduction to Physical Changes

MCQ▾

Question

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

Choices

Choice (4) Response

a.

Endothermic reaction

b.

Physical change

c.

Chemical change

d.

Exothermic reaction

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