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CTET Science MCQ - General Science

21 A body having mass 2.0 kg is dropped from height 10 m. When it reaches on Earth, its kinetic energy will be (g= 9.8 m / S²)

Kinetic energy = 1/2 mv²
Here v² = u² + 2as
= 0 + 2gh
= 2 x 9.8 x 10 = 196
Now K.E = 1/2 x 2 x 196 = 196 Joule

22 The number of electrons in 1 Coulomb charge is

The number of electrons in 1 Coulomb charge is 6.24 x 10¹⁸

23 Electronic configuration of AI ^{+ + +} is

Atomic number AI = 13
=> Electronic configuration of
Al = 2,8, 3
Now, Al⁺⁺⁺ = 2,8

24 When copper turnings are heated with conc. H₂SO₄, it evolves ......... gas

Cu + 2H₂SO₄ = CuSO₄ + SO₂ + H₂o

25 When a salt is treated with dil. hydrochloric acid, a gas evolves with brisk effervescence. When this gas is passed through lime water, it turns milky. The metal salt will be

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Question:

When a salt is treated with dil. hydrochloric acid, a gas evolves with brisk effervescence. When this gas is passed through lime water, it turns milky. The metal…

A. metal carbonate
B. metal sulphate
C. metal nitrate
D. metal chloride

Correct answer: A

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