NTSE Stage-2 (National-Level) Scholastic-Aptitude & Language Comprehension: Questions 368 - 370 of 816

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Question number: 368

» Chemistry » Acid Bases and Salt

MCQ▾

Question

An element when burnt in air forms an oxide which is a good dehydrating agent. The oxide on dissolution in water gives its oxyacid. The oxide forms salt with caustic soda but not with sulphuric acid. The oxyacid of the element is

Choices

Choice (4) Response

a.

phosphoric acid

b.

hypo phosphorus acid

c.

boric acid

d.

phosphorus acid

Question number: 369

» Physics » Light

MCQ▾

Question

Consider the following statements

I. Concave mirror forms virtual and enlarged image of a real object placed very near to it, so it is used by dentists to examine teeth.

II. Concave lens always form virtual image of smaller size of a real object and it is thinner in middle.

III. Plane mirror always forms virtual image of the same size of a real object.

IV. Convex mirror always forms virtual image of bigger size of a real object.

V. Convex lens forms real and diminished image of a real object placed near to it, so it is used as reading glass.

Which of the above statements is/are correct ?

Choices

Choice (4) Response

a.

I, II and III

b.

II and III

c.

IV and V

d.

All of the above

Question number: 370

» Biology » Soil

MCQ▾

Question

Which of the following is correct in response to soil?

Choices

Choice (4) Response

a.

Clay particles are light as they hold less water and the space between sand particles is less

b.

Clay particles are heavy as they hold more water and the space between sand particles is more

c.

Clay particles are heavy as they hold more water and the space between sand particles is less

d.

Clay particles are light as they hold more water and the space between sand particles is more

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