#### 10th Standard Science English Medium Free Online Test 1 Mark Questions with Answer Key 2020 - 2021 Part - 3

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. The physical quantity which is the measure of inertia is _______

(a)

density

(b)

weight

(c)

force

(d)

mass

3. A body of mass 1kg is attracted by the earth with a force which is equal to

(a)

9.8 N

(b)

6.67 x 1011

(c)

1 N

(d)

9.8 ms-1

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. The group of rays is ______

(a)

lines

(b)

dots

(c)

beam

(d)

none ofthese

6. A convex lens forms a virtual image if the object is

(a)

at F

(b)

At infinity

(c)

below F and 2 F

(d)

below the lens and the principal focus

7. Simple microscopes are used

(a)

To observe paths of flower

(b)

Watch repair

(c)

Observe finger prints

(d)

All the above

8. Thermal expansion atparticular temperature is less in

(a)

solid

(b)

liquid

(c)

gas

(d)

all above

9. The resistance of material depends on.

(a)

Temperature

(b)

Length of conductor

(c)

Area of cross-section

(d)

All the above

10. A 110 W, 220 V bulb draws a current.

(a)

2A

(b)

440 A

(c)

0.5 A

(d)

5.5 A

11. Velocity of sound in the atmosphere of a planet is 500 m s-1. The minimum distance between the sources of sound and the obstacle to hear the echo, should be

(a)

17 m

(b)

20 m

(c)

25 m

(d)

50 m

12. What is the frequency range of audible sound?

(a)

20 Hz to 20 kHz

(b)

1.5 Hz to 20 kHz

(c)

10 Hz to 15 kHz

(d)

20 Hz to 25 kHz

13. Proton - Proton chain reaction is an example of__________

(a)

Nuclear fission

(b)

$\alpha$ decay

(c)

Nuclear fusion

(d)

$\beta$ - decay

14. Complete the reaction: 88Ra226 ➝ 86Rn222+ ?

(a)

-1e0

(b)

1eo

(c)

2He4

(d)

0n1

15. BARC is situated at ________.

(a)

Trombay

(b)

Kalpakkam

(c)

Trivandrum

(d)

Thumba

16. The gram molecular mass of oxygen molecule is

(a)

16 g

(b)

18 g

(c)

32 g

(d)

17 g

17. Which of the contains maximum number of molecules

(a)

1 g of CO2

(b)

1g of N2

(c)

1 g of H2

(d)

1 g of CH4

18. Which of the following have inert gases 2 electrons in the outermost shell

(a)

He

(b)

Ne

(c)

Ar

(d)

Kr

19. Pottassium belongs to ________ period

(a)

First

(b)

Second

(c)

Third

(d)

Fourth

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. 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

22. Acids have pH

(a)

less than 7

(b)

greater than 7

(c)

equal to 7

(d)

less than 14

23. TFM in soaps represents ___________ content in soap

(a)

mineral

(b)

vitamin

(c)

fatty acid

(d)

carbohydrate

24. Ethanolis used as ______________

(a)

a preservative for biological specimen

(b)

an antifreeze

(c)

an antiseptic

(d)

all the above

25. Mammals are ______________ animals.

(a)

Cold blooded

(b)

Warm blooded

(c)

Poikilothermic

(d)

All the above

26. Each kidney is made up of several___________

(a)

mascula

(b)

nephrons

(c)

cortex

(d)

epididymis

27. Normal pulse rate ranges from________

(a)

80-90/min

(b)

70 -90/min

(c)

50 - 60 / min

(d)

70 - 80/ min

28. Nerve cells do not possess

(a)

neurilemma

(b)

sarcolemma

(c)

axon

(d)

dendrites

29. Pons is a bridge of ______

(a)

neuron

(b)

nerve fibre

(c)

neuroglia

(d)

glial cells

30. Syngamy results in the formation of____________

(a)

Zoospores

(b)

Conidia

(c)

Conidia

(d)

Chlamydospores

31. 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.

32. RDNA is a

(a)

vector DNA

(b)

circular DNA

(c)

recombinant of vector DNA and desired DNA

(d)

satellite DNA

33. What are the steps will you adopt for better waste management?

(a)

reduce the amount of waste formed

(b)

reuse the waste

(c)

recycle the waste

(d)

all of the above

34. Which is used to edit programs?

(a)

Inkscape

(b)

script editor

(c)

stage

(d)

sprite