CBSE Class 10th Science Mix Test

Result

CBSE Class 10th Science Mix Test - 3

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Question 1
1 / -0

A magnesium ribbon should be cleaned before burning in air because :

A
It forms a white layer of MgO

B
Unwanted impurities may have deposited on it

C
It becomes impure

D
Both (A) and (B) .

Solution

Magnesium ribbon should be cleaned with sandpaper before burning in air due to the following reasons:

(i) Magnesium is very reactive element which rapidly reacts with oxygen in the air to form a white layer of magnesium oxide, which may prevent or slow down the burning of magnesium ribbon.

(ii) Unwanted impurities deposited on the magnesium ribbon can be removed and only pure magnesium can be used for the reaction.
Question 2
1 / -0

Apart from carbon, a element which shows the property of catenation is :

A
Sodium

B
Silicon

C
Sulphur

D
None.

Solution

Like carbon, silicon also exhibit catenation.
Question 3
1 / -0

Assertion(A): Children with light colored eyes are likely to have parents with light colored eyes.

Reason(R): The light eye- color trait is dominant

A
Both A and R are true, and R is correct explanation of the assertion.

B
Both A and R are true, but R is not the correct explanation of the assertion.

C
A is true, but R is false.

D
A is false, but R is true.

Solution

Assertion may be true, but reason is false as we cannot say which trait is dominant or recessive unless we know the genotype of these variants of the trait.
Question 4
1 / -0

Assertion(A): Dobereiner arranged the elements with similar properties into groups having three elements each; called as Dobereiner’s triads.

Reason(R): The atomic mass of the middle element was roughly the average of the atomic masses of the other two elements.

A
Both A and R are true, and R is correct explanation of the assertion.

B
Both A and R are true, but R is not the correct explanation of the assertion.

C
A is true, but R is false.

D
A is false, but R is true.
Question 5
1 / -0

Assertion(A): Bamboo is used to make slats for huts, and baskets for collecting and storing food materials.

Reason(R): As bamboo is fastest growing plant on earth, so very less negative effects on environment.

A
Both A and R are true, and R is correct explanation of the assertion.

B
Both A and R are true, but R is not the correct explanation of the assertion.

C
A is true, but R is false.

D
A is false, but R is true.

Solution

Both assertion and reason is true, but reason is not the correct explanation of assertion.
Question 6
1 / -0

A milkman adds a very small amount of baking soda to fresh milk to shift the \(P^H\) of the fresh milk from 6 to slightly alkaline because :

A
Otherwise, the milk will get spoiled.

B
Then, milk can be kept for a relatively longer time without being spoiled.

C
It is easier now, to extract the cream of the milk.

D
Both (A) and (B).

Solution

when the milk is made more alkaline by adding a base to it, it is basically done to prevent it from being spoiled. Addition of baking soda increases the \(P^H\) of milk from 6.The milk is now alkaline. Due to this, milk can be kept for a relatively longer time.
Question 7
1 / -0

Silver bromide is known for its unusual sensitivity to light which has its application in :

A
Black and white photography

B
Electroplating

C
Solar cells

D
All.

Solution

Silver bromide is water insoluble salt known for its unusual sensitivity to light and this property has allowed silver halides to become the basis of modern photographic materials.

In the presence of sunlight, decomposition of silver bromide gives silver which turns grey on exposure to light.

\(2AgBr(s) \overset{sunlight}{\longrightarrow}2Ag(s)+Br_2(g)\)

This reaction is used in black and white photography.
Question 8
1 / -0

The magnetic field inside the body forms the basis of obtaining the images of different body parts. This is done using a technique called magnetic resonance imaging (MRI). Magnetism has, thus, got important uses in medicine.

Magnetic field in our body is produced by:

A
Digested food circulation

B
Muscular action

C
Weak ion currents that travel along the nerve cells

D
None
Question 9
1 / -0

The magnetic field inside the body forms the basis of obtaining the images of different body parts. This is done using a technique called magnetic resonance imaging (MRI). Magnetism has, thus, got important uses in medicine.

Strength of the magnetic field produced is about __________ of the earth’s magnetic field.

A
One- thousandth

B
One- millionth

C
One- billionth

D
None
Question 10
1 / -0

The magnetic field inside the body forms the basis of obtaining the images of different body parts. This is done using a technique called magnetic resonance imaging (MRI). Magnetism has, thus, got important uses in medicine.

Magnetic field of the body is:

A
Weak

B
Moderate

C
Strong

D
None

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Re-Attempt Weekly Quiz Competition

CBSE Class 10th Science Mix Test - 3

Result

CBSE Class 10th Science Mix Test - 3

Score

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Rank

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SHARING IS CARING

Question 1

It forms a white layer of MgO

Unwanted impurities may have deposited on it

It becomes impure

Both (A) and (B) .

Solution

Question 2

Sodium

Silicon

Sulphur

None.

Solution

Question 3

Both A and R are true, and R is correct explanation of the assertion.

Both A and R are true, but R is not the correct explanation of the assertion.

A is true, but R is false.

A is false, but R is true.

Solution

Question 4

Both A and R are true, and R is correct explanation of the assertion.

Both A and R are true, but R is not the correct explanation of the assertion.

A is true, but R is false.

A is false, but R is true.

Question 5

Both A and R are true, and R is correct explanation of the assertion.

Both A and R are true, but R is not the correct explanation of the assertion.

A is true, but R is false.

A is false, but R is true.

Solution

Question 6

Otherwise, the milk will get spoiled.

Then, milk can be kept for a relatively longer time without being spoiled.

It is easier now, to extract the cream of the milk.

Both (A) and (B).

Solution

Question 7

Black and white photography

Electroplating

Solar cells

All.

Solution

Question 8

Digested food circulation

Muscular action

Weak ion currents that travel along the nerve cells

None

Question 9

One- thousandth

One- millionth

One- billionth

None

Question 10

Weak

Moderate

Strong

None

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