NSO Level 1- Science Olympiad (SOF) Class 10: Questions 771 - 775 of 986

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Question number: 771

» Metals and Non - Metals

Edit
MCQ▾

Question

Which of the not an oxide ore of iron?

Choices

Choice (4) Response

a.

Hematite

b.

Siderite

c.

Magnetite

d.

Pyrite

Question number: 772

» Sources of Energy

Edit
MCQ▾

Question

The minimum wind speed for windmill to serve as a source of energy is

Choices

Choice (4) Response

a.

b.

c.

d.

Question does not provide sufficient data or is vague

Question number: 773

» Magnetic Effects of Electric Current

Edit
Match List-Ⅰ List-Ⅱ▾

Question

Match column I and column II and select the correct option from the codes given below.

List-Ⅰ (Column I) List-Ⅱ (Column II)

(A)

Galvanometer

(i)

Reverses the direction of flow of electric current

(B)

Split ring commutator

(ii)

Electromagnetic induction

(C)

Electrical generator

(iii)

Convert an AC generator into a DC generator

(D)

Commutator

(iv)

Detect the presence of a current in a circuit

Choices

Choice (4) Response
  • (A)
  • (B)
  • (C)
  • (D)

a.

  • (iv)
  • (iii)
  • (ii)
  • (i)

b.

  • (iv)
  • (ii)
  • (iii)
  • (i)

c.

  • (i)
  • (iii)
  • (iv)
  • (ii)

d.

  • (ii)
  • (iv)
  • (iii)
  • (i)

Question number: 774

» Acids, Bases and Salts

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MCQ▾

Question

Hydrochloric acid was added to Zinc kept in a test tube. A bubble of gas was evolved.

Choices

Choice (4) Response

a.

Bubble of hydrogen gas are formed

b.

A pop sound is obtained

c.

reacts with dilute and liberates hydrogen gas.

d.

All a. , b. and c. are correct

Question number: 775

» Acids, Bases and Salts

Edit
MCQ▾

Question

Given below are certain chemical properties of a substance:

(i) It turns blue litmus red

(ii) It turns red litmus blue

Which one correct for limewater?

Choices

Choice (4) Response

a.

Only (i)

b.

(i) and (ii)

c.

Only (ii)

d.

None of the above