CBSE Class 10th Science Mix Test

Question 1
1 / -0

Reema took 5ml of Lead Nitrate solution in a beaker and added approximately 4ml of Potassium Iodide solution to it. What would she observe?

A
The solution turned red.

B
Yellow precipitate was formed.

C
White precipitate was formed.

D
The reaction mixture became hot.

Question 2
1 / -0

Which of the following correctly represents a balanced chemical equation?

A
\(Fe(s)+4H_2O(g)\longrightarrow\)\(Fe_3O_4(s)+4H_2(g)\)

B
\(3Fe(s)+4H_2O(g)\longrightarrow\)\(Fe_3O_4(s)+4H_2(g)\)

C
\(3Fe(s)+H_2O(g)\longrightarrow\)\(Fe_3O_4(s)+H_2(g)\)

D
\(3Fe(s)+4H_2O(g)\longrightarrow\)\(Fe_3O_4(s)+H_2(g)\)

Question 3
1 / -0

In the reaction of iron with copper sulphate solution:

\(CuSO_4+Fe\longrightarrow\)\(Cu+FeSO_4\)

Which option in the given table correctly represents the substance oxidised and the reducing agent?

A

Substance Oxidized Reducing Agent

Fe Fe

B

Substance Oxidized Reducing Agent

Fe \(FeSO_4\)

C

Substance Oxidized Reducing Agent

Cu Fe

D

Substance Oxidized Reducing Agent

\(CuSO_4\) Fe

Question 4
1 / -0

The chemical reaction between copper and oxygen can be categorized as

A
Displacement reaction

B
Decomposition reaction

C
Combination reaction

D
Double displacement reaction

Question 5
1 / -0

Which of the given options correctly represents the Parent acid and base of Calcium Carbonate?

A

PARENT ACID PARENT BASE

\(HCl\) \(NaOH\)

B

PARENT ACID PARENT BASE

\(H_2CO_3\) \(Ca(OH)_ 2\)

C

PARENT ACID PARENT BASE

\(H_3PO_3\) \(CaSO_4\)

D

PARENT ACID PARENT BASE

\(H_2SO_4\) \(CaSO_4\)

Question 6
1 / -0

How will you protect yourself from the heat generated while diluting a concentrated acid?

A
By adding acid to water with constant stirring

B
By adding water to acid with constant stirring.

C
By adding water to acid followed by base.

D
By adding base to acid with constant stirring

Question 7
1 / -0

Why is it important to balance a skeletal chemical equation?

A
To verify law of conservation of energy.

B
To verify the law of constant proportion.

C
To verify the law of conservation of mass

D
To verify the law of conservation of momentum.

Question 8
1 / -0

Opening and closing of stomatal pore depends on:

A
Atmospheric temperature

B
oxygen concentration around stomata

C
carbon dioxide concentration around stomata

D
water content in the guard cells

Question 9
1 / -0

Which of the following mirror is used by a dentist to examine a small cavity in a patient’s teeth?

A
Convex mirror

B
Plane mirror

C
Concave mirror

D
Any spherical mirror

Question 10
1 / -0

Which of the following can make a parallel beam of light when light from a point source is incident on it?

A
Concave mirror as well as convex lens

B
Convex mirror as well as concave lens

C
Two plane mirrors placed at \(90^{\circ}\) to each others.

D
Concave mirror as well as concave lens

Question 11
1 / -0

Consider these indices of refraction: glass: 1.52; air: 1.0003; water: 1.333. Based on the refractive indices of three materials, arrange the speed of light through them in decreasing order

A
The speed of light in water > the speed of light in air > the speed of light in glass

B
The speed of light in glass > the speed of light in water > the speed of light in air.

C
The speed of light in air > the speed of light in water > the speed of light in glass.

D
The speed of light in glass > the speed of light in air > the speed of light in water

Question 12
1 / -0

If a beam of red light and a beam of violet light are incident at the same angle on the inclined surface of a prism from air medium and produce angles of refraction r and v respectively, which of the following is correct?

A
r = v

B
r > v

C
\(r=\frac{1}{v}\)

D
r < v

Question 13
1 / -0

Vinay observed that the stain of curry on a white shirt becomes reddish-brown when soap is scrubbed on it, but it turns yellow again when the shirt is washed with plenty of water.

What might be the reason for his observation?

i. Soap is acidic in nature

ii. Soap is basic in nature

iii. Turmeric is a natural indicator which gives reddish tinge in bases

iv. Turmeric is a natural indicator which gives reddish tinge in acids

A
i and ii

B
ii and iii

C
i and iv

D
ii and iv

Submit Test

Substance Oxidized	Reducing Agent
Fe	Fe

Substance Oxidized	Reducing Agent
Fe	\(FeSO_4\)

Substance Oxidized	Reducing Agent
Cu	Fe

Substance Oxidized	Reducing Agent
\(CuSO_4\)	Fe

CBSE Class 10th...

Question 1

The solution turned red.

Yellow precipitate was formed.

White precipitate was formed.

The reaction mixture became hot.

Question 2

\(Fe(s)+4H_2O(g)\longrightarrow\)\(Fe_3O_4(s)+4H_2(g)\)

\(3Fe(s)+4H_2O(g)\longrightarrow\)\(Fe_3O_4(s)+4H_2(g)\)

\(3Fe(s)+H_2O(g)\longrightarrow\)\(Fe_3O_4(s)+H_2(g)\)

\(3Fe(s)+4H_2O(g)\longrightarrow\)\(Fe_3O_4(s)+H_2(g)\)

Question 3

Substance Oxidized Reducing Agent Fe Fe

Substance Oxidized Reducing Agent Fe \(FeSO_4\)

Substance Oxidized Reducing Agent Cu Fe

Substance Oxidized Reducing Agent \(CuSO_4\) Fe

Question 4

Displacement reaction

Decomposition reaction

Combination reaction

Double displacement reaction

Question 5

PARENT ACID PARENT BASE \(HCl\) \(NaOH\)

PARENT ACID PARENT BASE \(H_2CO_3\) \(Ca(OH)_ 2\)

PARENT ACID PARENT BASE \(H_3PO_3\) \(CaSO_4\)

PARENT ACID PARENT BASE \(H_2SO_4\) \(CaSO_4\)

Question 6

By adding acid to water with constant stirring

By adding water to acid with constant stirring.

By adding water to acid followed by base.

By adding base to acid with constant stirring

Question 7

To verify law of conservation of energy.

To verify the law of constant proportion.

To verify the law of conservation of mass

To verify the law of conservation of momentum.

Question 8

Atmospheric temperature

oxygen concentration around stomata

carbon dioxide concentration around stomata

water content in the guard cells

Question 9

Convex mirror

Plane mirror

Concave mirror

Any spherical mirror

Question 10

Concave mirror as well as convex lens

Convex mirror as well as concave lens

Two plane mirrors placed at \(90^{\circ}\) to each others.

Concave mirror as well as concave lens

Question 11

The speed of light in water > the speed of light in air > the speed of light in glass

The speed of light in glass > the speed of light in water > the speed of light in air.

The speed of light in air > the speed of light in water > the speed of light in glass.

The speed of light in glass > the speed of light in air > the speed of light in water

Question 12

r = v

r > v

\(r=\frac{1}{v}\)

r < v

Question 13

i and ii

ii and iii

i and iv

ii and iv

User

Question Analysis

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Substance Oxidized Reducing Agent

Fe Fe

Substance Oxidized Reducing Agent

Fe \(FeSO_4\)

Substance Oxidized Reducing Agent

Cu Fe

Substance Oxidized Reducing Agent

\(CuSO_4\) Fe

PARENT ACID PARENT BASE

\(HCl\) \(NaOH\)

PARENT ACID PARENT BASE

\(H_2CO_3\) \(Ca(OH)_ 2\)

PARENT ACID PARENT BASE

\(H_3PO_3\) \(CaSO_4\)

PARENT ACID PARENT BASE

\(H_2SO_4\) \(CaSO_4\)