#### 10th Standard Science English Medium Free Online Test 1 Mark Questions with Answer Key 2020 - 2021 Part - 5

10th Standard

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Science

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

Part A

35 x 1 = 35
1. The mass of a body is measured on planet Earth as M kg. When it is taken to a planet of radius half that of the Earth then its value will be____kg

(a)

4 M

(b)

2 M

(c)

M/4

(d)

M

2. Mixing sugar in a glass of milk using a spoon is ______

(a)

force

(b)

momentum

(c)

inertia of motion

(d)

inertia of direction

3. The value of g

(a)

increases as we go above the earth's surface

(b)

decreases as we go to the centre of the earth

(c)

remains constant

(d)

is more at equator and less at poles

4. Which of the following lens would you prefer to use while reading small letters found in a dictionary?

(a)

A convex lens of focal length 5 cm

(b)

A concave lens of focal length 5 cm

(c)

A convex lens of focal length 10 cm

(d)

A concave lens of focal length 10 cm

5. Red light is used in traffic signals because

(a)

It has highest wavelength

(b)

disperses least

(c)

red is symbol of danger

(d)

both a & b

6. Lens formula is

(a)

$\frac { { h }^{ 1 } }{ h }$

(b)

$\frac { 1 }{ f } =\frac { 1 }{ v } -\frac { 1 }{ u }$

(c)

$\frac { v }{ u }$

(d)

$(\mu -1)\left( \frac { 1 }{ { R }_{ 1 } } -\frac { 1 }{ { R }_{ 2 } } \right)$

7. At constant temperature volume is inversely proportional to pressure of a gas is known as

(a)

Boyle's law

(b)

Charles

(c)

(d)

None

8. Why battery is used in the circuit?

(a)

Measure Current

(b)

Maintain a potential difference

(c)

Oppose the current

(d)

Measure potential

9. The speed of sound in air is 300 m/s. What is the frequency as heard by the human ear?

(a)

0.001 Hz

(b)

1 Hz

(c)

10,000 Hz

(d)

1,00,000 Hz

10. _____________ aprons are used to protect us from gamma radiations

(a)

(b)

Iron

(c)

(d)

Aluminium

11. Elements having atomic number greater than ________ are radioactive.

(a)

48

(b)

68

(c)

88

(d)

83

12. An atom which has a mass number of 14 and 8 neutrons is an

(a)

isotope of nitrogen

(b)

isotope of oxygen

(c)

isotope of carbon

(d)

isobar of carbon

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. Electronegativity values are based on ______________

(a)

bond energy

(b)

electron affinity

(c)

ionisation energy

(d)

all the above

15. The chemical equation Na2SO4(aq) + BaCl2(aq) → BaSO4(s)↓ + 2NaCl(aq) represents which of the following types of reaction?

(a)

Neutralisation

(b)

Combustion

(c)

Precipitation

(d)

Single displacement

16. Pick out
Compound + element ⟶ compound type of combination reaction

(a)

PCl5 ⟶ PCl3 + Cl2

(b)

Mg + O2 ⟶ 2MgO

(c)

PCl3 + Cl2 ⟶ PCl5

(d)

2Na + Cl2 ⟶ 2NaCl

17. Ethyl alcohol is mainly manufactured by

(a)

destructive distillation of wood

(b)

fermentation of molasses

(c)

dehydrogenation

(d)

Oxidation of ethane in the presence of K2Cr2O7/H+

18. Mammals are ______________ animals.

(a)

Cold blooded

(b)

Warm blooded

(c)

Poikilothermic

(d)

All the above

19. The_______ on both sides join to form the genital atrium in leech.

(a)

ejaculatory ducts

(b)

epididymis

(c)

sperm Vesicle

(d)

vas efferens

20. ___________is the main circulatory medium in the human body.

(a)

Blood

(b)

Water

(c)

Lymph

(d)

Plasma

21. The outer most of the three cranial meninges is

(a)

arachnoid membrane

(b)

piamater

(c)

duramater

(d)

myelin sheath

22. ______ is the largest portion nearly two - third of the brain.

(a)

Thalamus

(b)

Cerebrum

(c)

Diencephalon

(d)

Cerebellum

23. _____ is also called as Stress hormone.

(a)

Auxin

(b)

Abscisic Acid

(c)

Ethylene

(d)

Cytokinin

24. The large elongated cells that provide nutrition to developing sperms are

(a)

Primary germ cells

(b)

Sertoli cells

(c)

Leydig cells

(d)

Spermatogonia

25. After fertilization the _________disintegrates.

(a)

Ovule

(b)

Polar nuclei

(c)

Antipodals

(d)

Endosperm

26. ________is a disc shaped structure.

(a)

Uterus

(b)

Placenta

(c)

Ovary

(d)

Sperm

27. ________ is not an example of vestigial organ.

(a)

Coccyx

(b)

Appendix

(c)

Thick hair

(d)

Nictitating membrane

28. Radioactive Carbon (C14) dating method was discovered by_________

(a)

w. F.Libby

(b)

Niels Bohr

(c)

Issac Newton

(d)

William Harvey

29. Pusa Komal is a disease resistant variety of _________.

(a)

sugarcane

(b)

rice

(c)

cow pea

(d)

maize

30. In human beings, _________ of the DNA base sequences are the same and this is called as bulk genomic DNA.

(a)

99%

(b)

50%

(c)

90%

(d)

70%

31. Polyphagia is a condition seen in

(a)

Obesity

(b)

Diabetes mellitus

(c)

Diabetes insipidus

(d)

AIDS

32. World AIDS Day is observed on ______________

(a)

1st December

(b)

15th December

(c)

24th November

(d)

1st May

33. Common energy source in village is

(a)

electricity

(b)

coal

(c)

biogas

(d)

wood and animal dung

34. Medical waste is disposed by________

(a)

Sanitary land fill

(b)

Incineration

(c)

Composting

(d)

Segregation

35. Which button is presses to run the script?

(a)

Green flag

(b)

Red flag

(c)

Blue flag

(d)

Yellow flag