Tamilnadu 10th Standard Science Optics Important Questions Study Material - QB365

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Questions:

Multiple Choice Question

49 x 1 = 49

The volume occupied by 1 mole of diatomic gas at STP is

(a)

a) 11.2 litre

(b)

b) 5.6 litre

(c)

c) 22.4 litre

(d)

d) 44.8 litre

Powdered CaCO₃reacts more rapidly than flaky CaCO₃ because of __________.

(a)

large surface area

(b)

high pressure

(c)

high concentration

(d)

high temperature

The pH of a solution is 3. Its [OH^–] concentration is

(a)

1 × 10^–3 M

(b)

(c)

1 × 10^–11 M

(d)

11 M

A single displacement reaction is represented by X_(s) + 2HCl_(aq) → XCl_2(aq) + H_2(g). Which of the following(s) could be X. (i) Zn (ii) Ag (iii) Cu (iv) Mg. Choose the best pair.

(a)

i and ii

(b)

ii and iii

(c)

iii and iv

(d)

i and iv

The chemical equation Na₂SO_4(aq) + BaCl_2(aq) → BaSO_4(s)↓ + 2NaCl_(aq) represents which of the following types of reaction?

(a)

Neutralisation

(b)

Combustion

(c)

Precipitation

(d)

Single displacement

H_2(g) + Cl_29(g) → 2HCl_(g) is a

(a)

Decomposition Reaction

(b)

Combination Reaction

(c)

Single Displacement Reaction

(d)

Double Displacement Reaction

Which of the following is hygroscopic in nature?

(a)

ferric chloride

(b)

copper sulphate pentahydrate

(c)

silica gel

(d)

none of the above

Deliquescence is due to __________

(a)

Strong affinity to water

(b)

Less affinity to water

(c)

Strong hatred to water

(d)

Inertness to water

A 25% alcohol solution means

(a)

25 ml alcohol in 100 ml of water

(b)

25 ml alcohol in 25 ml of water

(c)

25 ml alcohol in 75 ml of water

(d)

75 ml alcohol in 25 ml of water

10.

Identify the non aqueous solution.

(a)

sodium chloride in water

(b)

glucose in water

(c)

copper sulphate in water

(d)

sulphur in carbon di sulphide

11.

A solution in which no more solute can be dissolved in a definite amount of solvent at a given temperature is called ___________

(a)

Saturated solution

(b)

Un saturated solution

(c)

Super saturated solution

(d)

Dilute solution

12.

Neon shows zero electron affinity due to _____.

(a)

stable arrangement of neutrons

(b)

stable configuration of electrons

(c)

reduced size

(d)

increased density

13.

The process of coating the surface of metal with a thin layer of zinc is called______.

(a)

painting

(b)

thinning

(c)

galvanization

(d)

electroplating

14.

Chemical formula of rust is ________.

(a)

FeO.xH₂O

(b)

FeO₄.xH₂O

(c)

Fe₂O₃.xH₂O

(d)

FeO

15.

_____ group contains the member of halogen family.

(a)

17^th

(b)

15^th

(c)

18^th

(d)

16^th

16.

The number of periods and groups in the periodic table are__________.

(a)

6,16

(b)

7,17

(c)

8,18

(d)

7,18

17.

In the nuclear reaction ₆X¹² \(\overset { \alpha \ decay }{ \longrightarrow } \) _zY^A, the value of A & Z.

(a)

8, 6

(b)

8, 4

(c)

4, 8

(d)

cannot be determined with the given data

18.

Which of the following statements is/are correct?
i. \(\alpha\) particles are photons
ii. Penetrating power of \(\gamma \) radiation is very low
iii. Ionization power is maximum for α rays
iv. Penetrating power of \(\gamma \) radiation is very high

(a)

(i) & (ii) are correct

(b)

(ii) & (iii) are correct

(c)

(iv) only correct

(d)

(iii) & (iv) are correct

19.

_____________ aprons are used to protect us from gamma radiations

(a)

Lead oxide

(b)

Iron

(c)

Lead

(d)

Aluminium

20.

In which of the following, no change in mass number of the daughter nuclei takes place
i) \(\alpha\) decay
ii) \(\beta\) decay
iii) \(\gamma \) decay
iv) neutron decay

(a)

(i) is correct

(b)

(ii) and (iii) are correct

(c)

(i) & ( iv) are correct

(d)

(ii) & (iv) are correct

21.

Which of the following are used as an aesthetics?

(a)

Carboxylic acids

(b)

Ethers

(c)

Esters

(d)

Aldehydes

22.

Rectified spirit is an aqueous solution which contains about _______ of ethanol

(a)

95.5 %

(b)

75.5 %

(c)

55.5 %

(d)

45.5 %

23.

C₂H₅OH + 3O₂ → 2CO₂ + 3H₂O is a

(a)

Reduction of ethanol

(b)

Combustion of ethanol

(c)

Oxidation of ethanoic acid

(d)

Oxidation of ethanal

24.

Which of the following pairs can be the successive members of a homologous series?

(a)

C₃H₈ and C₄H₁₀

(b)

C₂H₂ and C₂H₄

(c)

CH₄and C₃H₆

(d)

C₂H₅OH and C₄H₈OH

25.

The secondary suffix used in IUPAC nomenclature of an aldehyde is ____

(a)

- ol

(b)

– oic acid

(c)

– al

(d)

- one

26.

The sound waves are reflected from an obstacle into the same medium from which they were incident. Which of the following changes?

(a)

speed

(b)

frequency

(c)

wavelength

(d)

none of these

27.

The velocity of sound in air at a particular temperature is 330 ms^-1. What will be its value when temperature is doubled and the pressure is halved?

(a)

330 ms^-1

(b)

165 ms^-1

(c)

330 x \(\sqrt { 2 } \) ms^-1

(d)

320/\(\sqrt { 2 } \) ms^-1

28.

Velocity of sound in a gaseous medium is 330 ms^-1. If the pressure is increased by 4 times without causing a change in the temperature, the velocity of sound in the gas is

(a)

330 ms^-1

(b)

660 ms^-1

(c)

156 ms^-1

(d)

990 ms^-1

29.

When a sound wave travels through air, the air particles

(a)

vibrate along the direction of the wave motion

(b)

vibrate but not in any fixed direction

(c)

vibrate perpendicular to the direction of the wave motion

(d)

do not vibrate

30.

The gram molecular mass of oxygen molecule is

(a)

16 g

(b)

18 g

(c)

32 g

(d)

17 g

31.

In the nucleus of₂₀Ca⁴⁰, there are

(a)

20 protons and 40 neutrons

(b)

20 protons and 20 neutrons

(c)

20 protons and 40 electrons

(d)

40 protons and 20 electrons

32.

Mass of 1 mole of Nitrogen atom is

(a)

28 amu

(b)

14 amu

(c)

28 g

(d)

14 g

33.

Kilowatt hour is the unit of

(a)

resistivity

(b)

conductivity

(c)

electrical energy

(d)

electrical power

34.

In a simple circuit, why does the bulb glow when you close the switch?

(a)

The switch produces electricity

(b)

Closing the switch completes the circuit.

(c)

Closing the switch breaks the circuit.

(d)

The bulb is getting charged.

35.

SI unit of resistance is

(a)

mho

(b)

joule

(c)

ohm

(d)

ohm meter

36.

Which of the following is correct?

(a)

Rate of change of charge is electrical power

(b)

Rate of change of charge is current.

(c)

Rate of change of energy is current.

(d)

Rate of change of current is charge.

37.

Temperature is the average ______ of the molecules of a substance

(a)

difference in K.E and P.E

(b)

sum of P.E and K.E

(c)

difference in T.E and P.E

(d)

difference in K.E and T.E

38.

If a substance is heated or cooled, the linear expansion occurs along the axis of

(a)

X or –X

(b)

Y or –Y

(c)

both (a) and (b)

(d)

(a) or (b)

39.

If a substance is heated or cooled, the change in mass of that substance is

(a)

positive

(b)

negative

(c)

zero

(d)

none of the above

40.

The value of universal gas constant

(a)

3.81 J mol^–1 K^–1

(b)

8.03 J mol^–1 K^–1

(c)

1.38 J mol^–1 K^–1

(d)

8.31 J mol^–1K^–1

41.

The eye defect ‘presbyopia’ can be corrected by

(a)

convex lens

(b)

concave lens

(c)

convex mirror

(d)

Bi focal lenses

42.

Power of a lens is –4D, then its focal length is

(a)

(b)

–40m

(c)

–0.25 m

(d)

–2.5 m

43.

A small bulb is placed at the principal focus of a convex lens. When the bulb is switched on, the lens will produce

(a)

a convergent beam of light

(b)

a divergent beam of light

(c)

a parallel beam of light

(d)

a coloured beam of light

44.

The refractive index of four substances A, B, C and D are 1.31, 1.43, 1.33, 2.4 respectively. The speed of light is maximum in

(a)

(b)

(c)

(d)

45.

To project the rockets which of the following principle(s) is /(are) required?

(a)

Newton’s third law of motion

(b)

Newton’s law of gravitation

(c)

law of conservation of linear momentum

(d)

both a and c

46.

Plotting a graph for momentum on the Y-axis and time on X-axis. slope of momentum- time graph gives

(a)

Impulsive force

(b)

Acceleration

(c)

Force

(d)

Rate of force

47.

Newton’s III law is applicable

(a)

for a body is at rest

(b)

for a body in motion

(c)

both a & b

(d)

only for bodies with equal masses

48.

Impulse is equals to

(a)

rate of change of momentum

(b)

rate of force and time

(c)

change of momentum

(d)

rate of change of mass

49.

Inertia of a body depends on

(a)

weight of the object

(b)

acceleration due to gravity of the planet

(c)

mass of the object

(d)

Both a & b

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Answers Key:

Multiple Choice Question

49 x 1 = 49

(a)
large surface area

(d)
i and iv

(b)
Combination Reaction

(a)
Strong affinity to water

10.

(d)
sulphur in carbon di sulphide

11.

(a)
Saturated solution

12.

(b)
stable configuration of electrons

13.

14.

15.

(a)
17^th

16.

(d)
7,18

17.

(b)
8, 4

18.

(d)
(iii) & (iv) are correct

19.

20.

(b)
(ii) and (iii) are correct

21.

(b)
Ethers

22.

(a)
95.5 %

23.

(b)
Combustion of ethanol

24.

(a)
C₃H₈ and C₄H₁₀

25.

26.

(d)
none of these

27.

28.

(a)
330 ms^-1

29.

(a)
vibrate along the direction of the wave motion

30.

31.

(b)
20 protons and 20 neutrons

32.

(d)
14 g

33.

34.

(b)
Closing the switch completes the circuit.

35.

36.

(b)
Rate of change of charge is current.

37.

38.

(d)
(a) or (b)

39.

40.

(d)
8.31 J mol^–1K^–1

41.

(d)
Bi focal lenses

42.

43.

44.

(a)
A

45.

(d)
both a and c

46.

47.

48.

49.

Tamilnadu 10th Standard Science Optics Important Questions Study Material - QB365

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Std: 10th Standard - Science

chapter: Optics - Important Questions And Answers

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Questions:

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Answers Key:

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