#### 10th Standard Science English Medium Free Online Test 1 Mark Questions 2020 - 2021 Part - Ten

10th Standard

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Science

Time : 00:35:00 Hrs
Total Marks : 35

Part A

35 x 1 = 35
1. One kilogram force equals to

(a)

9.8 dyne

(b)

9.8 × 104 N

(c)

98 × 104 dyne

(d)

980 dyne

2. The law that gives a qualitative definition of force is _______

(a)

Newton's I law

(b)

Newton's II law

(c)

Newton's III law

(d)

Law of gravitation

3. According to the Newton's III law of motion, action & reaction

(a)

always act on the same body

(b)

have same magnitude & direction

(c)

always act in opposite directions

(d)

act on either body at normal to each other

4. Velocity and wavelength of light are related by a relation

(a)

g-c⋋

(b)

$\gamma =\frac { c }{ \lambda }$

(c)

c=$\gamma$

(d)

both b & c

5. The image formation by spherical lenses is due to the phenomenon of

(a)

reflection

(b)

refraction

(c)

interference

(d)

dispersion

6. The diameter of eyeball is

(a)

2.3 cm

(b)

23 cm

(c)

2.3 mm

(d)

23 mm

7. Image formed in simple microscope is

(a)

Erect

(b)

Inverted

(c)

Smaller than object

(d)

Bright

8. Kilowatt - hour is the unit of

(a)

Power

(b)

Potential difference

(c)

Force

(d)

Electrical energy

9. The expression for the heat is

(a)

H=VIt

(b)

H=I2Rt

(c)

$H=\frac { { V }^{ 2 } }{ R } t$

(d)

all the above

10. A car playing music at a frequency of 250 Hz moves at 20 m/s towards an observer that has frequency. What frequency the observer can hear when
(i) it approaches and
(ii) when it passes by?

(a)

approaching: $250\times \left( \frac { v+20 }{ v } \right) ;$
leaving: $\\ 250\times \left( \frac { v-20 }{ v } \right)$

(b)

approaching: $\\ 250\times \left( \frac { v }{ v+20 } \right) ;$
leaving: $250\times \left( \frac { v }{ v-20 } \right)$

(c)

approaching:$250\times \left( \frac { v-20 }{ v } \right) ;$
leaving: $250\times \left( \frac { v+20 }{ v } \right)$

(d)

approaching: $250\times \left( \frac { v }{ v-20 } \right) ;$
leaving: $250\times \left( \frac { v }{ v+20 } \right)$

11. When sound travels through air, the air particles.

(a)

do not vibrate

(b)

vibrate but not in any fixed direction

(c)

vibrate perpendicular to the direction of wave propagation

(d)

vibrate along the direction of wave propagation

12. Which of the following is/are correct?
i. Chain reaction takes place in a nuclear reactor and an atomic bomb.
ii. The chain reaction in a nuclear reactor is controlled
iii. The chain reaction in a nuclear reactor is not controlled
iv. No chain reaction takes place in an atom bomb

(a)

(i) only correct

(b)

(i) & (ii) are correct

(c)

(iv) only correct

(d)

(iii) & (iv) are correct

13. _______ rays contain 1 - unit of negative charge.

(a)

Alpha

(b)

Beta

(c)

Gamma

(d)

Hydrogen

14. If the exposure is about 600 R, it causes __________.

(a)

skin disorder

(b)

hair loss

(c)

teeth loss

(d)

death

15. Mass of the fissile material at the critical size is called _______.

(a)

Cut - off mass

(b)

Einstein's mass value

(c)

Curie mass

(d)

Critical mass

16. 1 mole of any substance contains __________ molecules

(a)

6.023 × 1023

(b)

6.023 × 1023

(c)

3.0115 × 1023

(d)

12.046 × 1023

17. Atomicity of Chlorine and Neon is

(a)

Mono atomic and mono atomic

(b)

Mono atomic and diatomic

(c)

Diatomic and diatomic

(d)

Diatomic and mono atomic

18. Atomicity of Sulphur is

(a)

1

(b)

2

(c)

4

(d)

8

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

(a)

painting

(b)

thinning

(c)

galvanization

(d)

electroplating

20. Deliquescence is due to __________

(a)

Strong affinity to water

(b)

Less affinity to water

(c)

Strong hatred to water

(d)

Inertness to water

21. In exothermic process as the temperature increases, solubility of the salt is _____________

(a)

decreases

(b)

increases

(c)

no change

(d)

increase and then remains constant

22. A single displacement reaction is represented by X(s) + 2HCl(aq) → XCl2(aq) + H2(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

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

(a)

95.5 %

(b)

75.5 %

(c)

55.5 %

(d)

45.5 %

24. Ethanolis used as ______________

(a)

a preservative for biological specimen

(b)

an antifreeze

(c)

an antiseptic

(d)

all the above

25. Kreb’s cycle takes place in

(a)

chloroplast

(b)

mitochondrial matrix

(c)

stomata

(d)

inner mitochondrial membrane

26. Dental formula of rabbit is______

(a)

$\cfrac { 2033 }{ 1023 }$

(b)

$\cfrac { 2003 }{ 1003 }$

(c)

$\cfrac { 2030 }{ 1020 }$

(d)

$\cfrac { 2023 }{ 1220 }$

27. Which of the following process requires energy?

(a)

active transport

(b)

diffusion

(c)

osmosis

(d)

all of them

28. Normal pulse rate ranges from________

(a)

80-90/min

(b)

70 -90/min

(c)

50 - 60 / min

(d)

70 - 80/ min

29. Vomiting centre is located in

(a)

medulla oblongata

(b)

stomach

(c)

cerebrum

(d)

hypothalamus

30. The ______ is the controlling centre of all the body activities.

(a)

heart

(b)

brain

(c)

kidney

(d)

liver

31. ______ is essential for Morphogenesis.

(a)

Auxin and Gibberellin

(b)

Ethylene

(c)

Auxin and Cytokinin

(d)

Cytokinin and Abscissic acid

32. Asexual reproduction takes place through budding in ___________

(a)

Amoeba

(b)

Yeast

(c)

Plasmodium

(d)

Bacteria

33. The number of chromosomes found in human beings are __________________.

(a)

22 pairs of autosomes and 1 pair of allosomes

(b)

22 autosomes and 1 allosome

(c)

46 autosomes

(d)

46 pairs autosomes and 1 pair of allosomes.

34. The term Ethnobotany was coined by

(a)

Khorana

(b)

J.W. Harsbberger

(c)

Ronald Ross

(d)

Hugo de Vries

35. Which software is used to create animation?

(a)

Paint

(b)

PDF

(c)

MS Word

(d)

Scratch