Question

physical science class 10 wbbse board solution

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Answer 1

Answer:

1. Multiple choice questions. Choose the correct answer from the 4 options given below.

[1 x 15= 15]

1.1 Which among the following gases absorbs long wavelength infrared radiation emitted from the earth’s surface?

a. N2

b. O2

c. CH4

d. He

1.2 At STP, 2.24 L is occupied by

[C=12, O=16, S=32]

a. 4.4 gCO2

b. 0.64 gSO2

c. 28 g CO

d. 16 g O2

1.3 How many molecules of CO2 will be produced when 1 mole C reacts completely with 1 mole O2?

a. 6.022 x 1023

b. 1.806 x 1024

c. 6.022 x 1022

d. 6.022 x 1024

1.4 For a solid, how many types of thermal expansion coefficients are there?

a. one

b. two

c. three

d. four

1.5 Which one of the following has the highest wavelength?

a. X-ray

b. Ɣ- ray

c. Infrared ray

d. Ultraviolet ray

1.6 In the case of refraction, if the angle of incidence and the angle of refraction are 45° and 30°, respectively, then the angle of deviation is

a. 75°

b. 15°

c. 7.5°

d. 315°

1.7 If the temperature remains constant when the potential difference between the two ends of a conductor is V, and the current through the conductor is I, then which of the following is true?

a. V ∝ I

b. V ∝ I2

c. V ∝ I-1

d. V ∝ I-2

1.8 The relation among electromotive force (V), work (W) and charge (Q) is

a. Q= WV

b. Q= V/W

c. Q V/ W2

d. Q= W/V

1.9 For the atom produced by β-particle emission from a radioactive atom

a. mass number increases

b. atomic number increases

c. mass number decreases

d. atomic number decreases

1.10 To which group of the long periodic table do the halogen elements belong?

a. group 1

b. group 16

c. group 17

d. group 2