CBSE Class 10th Science Mix Test

Question 1
1 / -0

Assertion: Fresh milk in which baking soda is added, takes a longer time to set as curd.

Reason: Baking soda decreases the pH value of fresh milk to below 6.

A
Both A and R are true and R is the correct explanation of A

B
Both A and R are true and R is not the correct explanation of A

C
A is true but R is false

D
A is False but R is true

Question 2
1 / -0

Assertion: Decomposition of vegetable matter into compost is an endothermic reaction.

Reason: Decomposition reaction involves breakdown of a single reactant into simpler products

A
Both A and R are true and R is the correct explanation of A

B
Both A and R are true and R is not the correct explanation of A

C
A is true but R is false

D
A is False but R is true

Question 3
1 / -0

Assertion: Resins and gums are stored in old xylem tissue in plants.

Reason:Resins and gums facilitate transport of water molecules.

A
Both A and R are true and R is the correct explanation of A

B
Both A and R are true and R is not the correct explanation of A

C
A is true but R is false

D
A is False but R is true

Question 4
1 / -0

Assertion: Sky appears blue in the day time.

Reason: White light is composed of seven colours.

A
Both A and R are true and R is the correct explanation of A

B
Both A and R are true and R is not the correct explanation of A

C
A is true but R is false

D
A is False but R is true

Question 5

1 / -0

The table given below shows the reaction of a few elements with acids and bases to evolve Hydrogen gas

Element	Acid	Base
A	\(\times\)	\(\times\)
B	\(\checkmark\)	\(\checkmark\)
C	\(\checkmark\)	\(\times\)
D	\(\checkmark\)	\(\checkmark\)

Which of these elements form amphoteric oxides?

A and D

B and D

A and C

B and D

Question 6
1 / -0

In which of the following groups of organisms, blood flows through the heart only once during one cycle of passage through the body?

A
Rabbit, Parrot, Turtle

B
Frog, crocodile, Pigeon

C
Whale, Labeo, Penguin

D
Shark, dog fish, sting ray

Question 7
1 / -0

What is common between extensive network of blood vessels around walls of alveoli and in glomerulus of nephron?

A
Thick walled arteries richly supplied with blood

B
Thin walled veins poorly supplied with blood

C
Thick walled capillaries poorly supplied with blood

D
Thin walled capillaries richly supplied with blood

Question 8
1 / -0

Plants use completely different process for excretion as compared to animals. Which one of the following processes is NOT followed by plants for excretion?

A
They can get rid of excess water by transpiration.

B
They selectively filter toxic substances through their leaves

C
Waste products are stored as resins and gums in old xylem.

D
They excrete waste substances into the soil around them.

Question 9
1 / -0

If the power of a lens is - 4.0 D, then it means that the lens is a

A
concave lens of focal length -50 m

B
convex lens of focal length +50 cm

C
concave lens of focal length -25 cm

D
convex lens of focal length -25 m

Question 10
1 / -0

Rays from Sun converge at a point 15 cm in front of a concave mirror. Where should an object be placed so that size of its image is equal to the size of the object?

A
30 cm in front of the mirror

B
15 cm in front of the mirror

C
Between 15 cm and 30 cm in front of the mirro

D
More than 30 cm in front of the mirror

Question 11
1 / -0

In which of the following groups of organisms, food material is broken down outside the body and then absorbed in?

A
mushroom, green plants, amoeba

B
yeast, mushroom, bread mould

C
paramecium, amoeba, cuscuta

D
cuscuta, lice, tapeworm

Question 12
1 / -0

In a person the tubule part of the nephron is not functioning at all. What will its effect be on urine formation?

A
The urine will not be formed

B
Quality and quantity of urine is unaffected

C
Urine is more concentrated

D
Urine is more diluted

Question 13
1 / -0

If the real image of a candle flame formed by a lens is three times the size of the flame and the distance between lens and image is 80 cm, at what distance should the candle be placed from the lens?

A
-80cm

B
-40 cm

C
\(-\frac{40}{3}cm\)

D
\(-\frac{80}{3}cm\)

Question 14
1 / -0

The refractive index of flint glass is 1.65 and that for alcohol is 1.36 with respect to air. What is the refractive index of the flint glass with respect to alcohol ?

A
0.82

B
1.21

C
1.11

D
1.01

Question 15

1 / -0

A cable manufacturing unit tested few elements on the basisof their physical properties

Properties	W	X	Y	Z
Malleable	Yes	No	No	Yes
Ductile	Yes	No	No	Yes
Electrical conductivity	Yes	Yes	Yes	No
Melting Point	High	Low	Low	High

Which of the above elements were dicarded for usage by the company?

W, X, Y

X, Y, Z

W, X, Z

Z, X, Y

Question 16
1 / -0

Which compound in the table reacts with acids to release carbon dioxide?

A
\(NaCl\)

B
\(CaSO_4\)

C
\(CaCO_3\)

D
\(MgSO_4\)

Question 17
1 / -0

How many grams of Magnesium Sulphate are present in 135g of solid left by evaporation of sea water?

A
6g

B
12g

C
18g

D
24g

Question 18
1 / -0

What is the saturated solution of Sodium Chloride called?

A
Brine

B
Lime water

C
Slaked lime

D
Soda water

Question 19
1 / -0

What is the pH of the acid which is used in the formation of common salt?

A
Between 1 to 3

B
Between 6 to 8

C
Between 8 to 10

D
Between 11 to 13

Question 20
1 / -0

This experimental set up is used to prove essentiality of which of the following requirements of photosynthesis?

A
Chlorophyll

B
Oxygen

C
Carbon dioxide

D
Sunlight

Question 21
1 / -0

The function of KOH is to absorb

A
Oxygen

B
Carbon dioxide

C
Moisture

D
Sunlight

Question 22
1 / -0

Which of the following statements shows the correct results of Iodine Test performed on the leaf from plant X and Y respectively?

A
Blue - black colour would be obtained on the leaf of plant X and no change in colour on leaf of plant Y

B
Blue - black colour would be obtained on the leaf of plant Y and no change in colour onleaf of plant X.

C
Red colour would be obtained on the leaf of plant X and brown colour on the leaf of plant Y.

D
Red colour would be obtained on the leaf of plant Y and brown colour on the leaf of plant X

Question 23
1 / -0

Which of the following steps can be followed for making the apparatus air tight?

i. placing the plants on glass plate

ii. using a suction pump.

iii. applying vaseline to seal the bottom of jar.

iv. creating vacuum

A
i and ii

B
ii. and iii

C
i. and iii

D
ii. and iv

Question 24
1 / -0

What could be the ‘X’ that she placed inside the box to make the rays behave as shown?

A
a converging lens

B
a parallel-sided glass block

C
a plane mirror

D
a triangular prism

Question 25
1 / -0

She measured the angles of incidence for both the rays on the left side of the box to be \(48.6^{\circ}\). She knew the refractive index of the material ‘X’ inside the box was 1.5. What will be the approximate value of angle of refraction?

(use the value: sin \(48.6^{\circ} \approx 0.75\))

A
\(45^{\circ}\)

B
\(40^{\circ}\)

C
\(30^{\circ}\)

D
\(60^{\circ}\)

Question 26
1 / -0

Her friend noted the following observations from this demonstration:

i. Glass is optically rarer than air.

ii. Air and glass allow light to pass through them with the same velocity.

iii. Air is optically rarer than glass.

iv. Speed of light through a denser medium is faster than that of a rarer medium.

v. The ratio: sin of angle of incidence in the first medium to the ratio of sin of angle of refraction in the second medium, gives the refractive index of the second material with respect to the first one.

Which one of the combination of the above statements given below is correct.

A
ii, iv and v are correct.

B
iii and iv are correct.

C
i, iv and v are correct

D
iii and v are correct

Question 27
1 / -0

If the object inside the box was made of a material with a refractive index less than 1.5 then the

A
lateral shift of the rays would have been less.

B
lateral shift of the rays would have been more

C
lateral shift of the rays would remain the same as before.

D
there is not enough information to comment on any of the above statements

Submit Test

CBSE Class 10th...

Question 1

Both A and R are true and R is the correct explanation of A

Both A and R are true and R is not the correct explanation of A

A is true but R is false

A is False but R is true

Question 2

Both A and R are true and R is the correct explanation of A

Both A and R are true and R is not the correct explanation of A

A is true but R is false

A is False but R is true

Question 3

Both A and R are true and R is the correct explanation of A

Both A and R are true and R is not the correct explanation of A

A is true but R is false

A is False but R is true

Question 4

Both A and R are true and R is the correct explanation of A

Both A and R are true and R is not the correct explanation of A

A is true but R is false

A is False but R is true

Question 5

A and D

B and D

A and C

B and D

Question 6

Rabbit, Parrot, Turtle

Frog, crocodile, Pigeon

Whale, Labeo, Penguin

Shark, dog fish, sting ray

Question 7

Thick walled arteries richly supplied with blood

Thin walled veins poorly supplied with blood

Thick walled capillaries poorly supplied with blood

Thin walled capillaries richly supplied with blood

Question 8

They can get rid of excess water by transpiration.

They selectively filter toxic substances through their leaves

Waste products are stored as resins and gums in old xylem.

They excrete waste substances into the soil around them.

Question 9

concave lens of focal length -50 m

convex lens of focal length +50 cm

concave lens of focal length -25 cm

convex lens of focal length -25 m

Question 10

30 cm in front of the mirror

15 cm in front of the mirror

Between 15 cm and 30 cm in front of the mirro

More than 30 cm in front of the mirror

Question 11

mushroom, green plants, amoeba

yeast, mushroom, bread mould

paramecium, amoeba, cuscuta

cuscuta, lice, tapeworm

Question 12

The urine will not be formed

Quality and quantity of urine is unaffected

Urine is more concentrated

Urine is more diluted

Question 13

-80cm

-40 cm

\(-\frac{40}{3}cm\)

\(-\frac{80}{3}cm\)

Question 14

0.82

1.21

1.11

1.01

Question 15

W, X, Y

X, Y, Z

W, X, Z

Z, X, Y

Question 16

\(NaCl\)

\(CaSO_4\)

\(CaCO_3\)