#### 10th Standard Science English Medium Free Online Test 1 Mark Questions with Answer Key 2020 - 2021 Part - 8

10th Standard

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Science

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

Part A

35 x 1 = 35
1. 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

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 ball is thrown up, the value of g will be

(a)

zero

(b)

+ve

(c)

-ve

(d)

negligible

4. In a myopic eye, the image of the object is formed

(a)

behind the retina

(b)

on the retina

(c)

in front of the retina

(d)

on the blind spot

5. _____ determines speed of light in a medium.

(a)

thickness

(b)

wavelength

(c)

refractive index

(d)

both b and c

6. Convex lenses are used in

(a)

camera

(b)

magnifying lens

(c)

microscope

(d)

all the above

7. As compare to single lens, compound microscope gives ______ magnification

(a)

Smaller

(b)

Greater

(c)

No

(d)

Equal

8. In the Given diagram, the possible direction of heat energy transformation is

(a)

A$\leftarrow$B, A$\leftarrow$C, B$\leftarrow$C

(b)

A$\rightarrow$B, A$\rightarrow$C, B$\rightarrow$C

(c)

A$\rightarrow$B, A$\leftarrow$C, B$\rightarrow$C

(d)

A$\leftarrow$B, A$\rightarrow$C, B$\leftarrow$C

9. According to Charles's law

(a)

P ∝ $\frac{1}{V}$

(b)

V ∝ T

(c)

V ∝ n

(d)

all the above

10. Why battery is used in the circuit?

(a)

Measure Current

(b)

Maintain a potential difference

(c)

Oppose the current

(d)

Measure potential

11. A heating element used in the electric iron box and the electric heater is

(a)

Tungsten

(b)

Nichrome

(c)

(d)

All the above

12. Radioactive materials are kept -in thick -walled ________ containers.

(a)

aluminium

(b)

iron

(c)

brick

(d)

13. Which of the following statement is incorrect?

(a)

12 gram of C – 12 contains Avogadro’s number of atoms.

(b)

One mole of oxygen gas contains Avogadro’s number of molecules

(c)

One mole of hydrogen gas contains Avogadro’s number of atoms

(d)

One mole of electrons stands for 6.023 × 1023 electrons.

14. The mass of an atom is measured in ____________

(a)

kg

(b)

amu

(c)

g

(d)

Pm

15. Which of the following correctly represent 360 g of water
(i) 2 moles of H2O
(ii) 20 moles of water
(iii) 6.023 x 1023 molecules of water
(iv) 1.2046 x 1024 molecules of water

(a)

(i)

(b)

(i) and (iv)

(c)

(ii) and (iii)

(d)

(ii) and (iv)

16. Modern periodic law is based on __________

(a)

atomic mass

(b)

atomic number

(c)

number of neutrons

(d)

Both (a) and (b)

17. Example for solid in solid ___________

(a)

Soda water

(b)

Camphor in air

(c)

Charcoal

(d)

alloy

18. 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

19. Which of the following are used as anaesthetics?

(a)

Carboxylic acids

(b)

Ethers

(c)

Esters

(d)

Aldehydes

20. Identify the ketone among the following

(a)

CH3COCH3

(b)

CH3CHO

(c)

CH3COOH

(d)

CH3COOCH3

21. The body of leech has

(a)

23 segments

(b)

33 segments

(c)

38 segments

(d)

30 segments

22. Dental formula of rabbit is______

(a)

$\cfrac { 2033 }{ 1023 }$

(b)

$\cfrac { 2003 }{ 1003 }$

(c)

$\cfrac { 2030 }{ 1020 }$

(d)

$\cfrac { 2023 }{ 1220 }$

23. A patient with blood group O was injured in an accident and has blood loss. Which group of blood should be used by doctor for transfusion?

(a)

O group

(b)

AB group

(c)

A or B group

(d)

all blood group

24. _______is not a feature of osmosis

(a)

Semi permeable membrane

(b)

Movement of solvent

(c)

Both a and b

(d)

Involves energy

25. Node of Ranvier is found in

(a)

muscles

(b)

axons

(c)

dendrites

(d)

cyton

26. _____ is the longest cell of the human body.

(a)

Neuron

(b)

Neuroglia

(c)

Nerve fibres

(d)

Cyton

27. Identify the exocrine gland

(a)

Pituitary gland

(b)

(c)

Salivary gland

(d)

Thyroid gland

28. Auxins were identified by ______

(a)

Darwin

(b)

Kogi

(c)

Went

(d)

Funk

29. Thyroid gland requires _____ of iodine everyday for the production of thyroxine.

(a)

120 μg

(b)

110 μg

(c)

100 μg

(d)

150 μg

30. A single highly coiled tube where sperms are stored, get concentrated and mature is known as

(a)

Epididymis

(b)

Vasa efferentia

(c)

Vas deferens

(d)

Seminiferous tubules

31. _______from the posterior pituitary stimulates the uterine contractions

(a)

Oxytocin

(b)

Insulin

(c)

Estrogen

(d)

Prolactin

32. Okasaki fragments are joined together by ___________________.

(a)

Helicase

(b)

DNA polymerase

(c)

RNA primer

(d)

DNA ligase

33. World 'No Tobacco Day' is observed on

(a)

May 31

(b)

June 6

(c)

April 22

(d)

October 2

34. Soil erosion can be prevented by

(a)

deforestation

(b)

afforestion

(c)

over growing

(d)

removal of vegetation