Matter in Our Surroundings Test

Result

Matter in Our Surroundings Test - 2

Score
-
out of -
Rank
-
out of -

TIME Taken - -

SHARING IS CARING

If our Website helped you a little, then kindly spread our voice using Social Networks. Spread our word to your readers, friends, teachers, students & all those close ones who deserve to know what you know now.

Weekly Quiz Competition

Question 1
1 / -0

What is the value of latent heat of fusion for ice?

A
30 calories per gram

B
100 calories per gram

C
80 calories per gram

D
50 calories per gram

Solution

The latent heat of fusion of ice is 80 calories per gram.
(Or, 80 x 4.2 = 336 joules per gram)
Question 2
1 / -0

A liquid kept in an open vessel undergoes evaporation. The particles of liquid absorb energy from surroundings to regain the energy lost during evaporation. This absorption of energy from the surroundings results in

(i) an increase in the temperature of the surroundings
(ii) a decrease in the temperature of the surroundings
(iii) no change in the temperature of the surroundings
(iv) an increase/a decrease in the temperature of the surroundings depending upon the nature of the liquid

Which of the above points is/are is correct?

A
Only (i) is correct.

B
Only (i) and (ii) are correct.

C
Only (ii) is correct.

D
All are correct.

Solution

During evaporation, the latent heat of vaporisation is absorbed from the surroundings, which leads to the cooling of the surroundings.
Question 3
1 / -0

In which of the following cases is the rate of cooking very slow?

A
In a pressure cooker at sea level

B
In a pressure cooker at higher altitudes

C
In an open vessel at sea level

D
In an open vessel at higher altitudes

Solution

The rate of cooking depends on the boiling point of water at the given atmospheric pressure which is maintained as the steady temperature during the process of cooking.

The pressure at higher altitudes is low and hence, the boiling point of water is low and the rate of cooking is also slow.

Moreover cooking in a pressure cooker is faster as additional pressure increase the boiling point of water.
Question 4
1 / -0

Directions For Questions

The following question consists of an Assertion (A) and a Reason (R). Read both statements carefully and mark the appropriate option.

...view full instructions

(A) Assertion: Ice in a perfectly insulated thermos flask will melt when brought from hills to the plains.
(R) Reason: The freezing point is lower at sea level than at higher altitudes.

A
Both (A) and (R) are correct and (R) is the right explanation of (A).

B
Both (A) and (R) are correct, but (R) is not the right explanation of (A).

C
(A) is correct and (R) is incorrect.

D
(A) is incorrect and (R) is correct.

Solution

For most substances, the freezing point rises, though only very slightly, with increased pressure. Water is one of the very rare substances that expands upon freezing. Consequently, its melting temperature falls very slightly if pressure is increased.

On moving from hills to plains, the atmospheric pressure increases and hence, the freezing point of water decreases.

Note: The effect of the temperature change is ignored here as the thermos flask is assumed to be perfectly insulated.
Question 5
1 / -0

Substances that sublime

A
have low freezing points

B
have weak intermolecular forces of attraction

C
cannot be ionic compounds

D
have low vapour pressures

Solution

The substances that sublime have weak intermolecular forces of attraction and high vapour pressures. They are usually molecular compounds, but NH₄Cl is an example of an ionic compound that sublimes.
Question 6
1 / -0

The working of a syringe is based on

A
Charles' law

B
Graham's law

C
Boyle's law

D
diffusion

Solution

A syringe works on the principle of Boyle's law that, at a constant temperature, the volume occupied by a gas is inversely proportional to the pressure applied.
Question 7
1 / -0

Which sample at S.T.P. has same number of molecules as 5 L of NO₂(g) has at S.T.P?

A
5 g of H₂(g)

B
5 L of methane (g)

C
5 moles of O₂ (g)

D
5 × 10²³ molecules of CO₂(g)

Solution

According to Avogadro's law, under similar conditions of temperature and pressure, equal volumes of gases will have equal number of moles and hence, equal number of molecules.

Therefore equal volumes of gases under similar conditions of temperature and pressure implies equal moles and consequently equal number of molecules.
Question 8
1 / -0

Which of the following substances is known as 'dry ice'?

A
Potassium permanganate

B
Copper sulphate

C
Sulphur dioxide

D
Solid carbon dioxide

Solution

Solid carbon dioxide is known as 'dry ice'. Carbon dioxide is a sublimable substance and on increasing the pressure, it sublimes to the solid state.
Question 9
1 / -0

The fixed temperature at which the solid and liquid states of a substance exist in equilibrium under 1 atm pressure is called

A
melting point or freezing point

B
boiling point or freezing point

C
boiling point or melting point

D
boiling point or point of condensation

Solution

The melting point and the freezing of a substance represent the same temperature at which a substance changes from solid to liquid state on heating or liquid to solid on cooling. At this temperature, both the solid and the liquid state will co-exist in equilibrium.

User

Question Analysis

Correct -
Wrong -
Skipped -

My Perfomance

Score
-
out of -
Rank
-
out of -

Re-Attempt Weekly Quiz Competition

Matter in Our Surroundings Test - 2

Result

Matter in Our Surroundings Test - 2

Score

-

Rank

-

SHARING IS CARING

Question 1

30 calories per gram

100 calories per gram

80 calories per gram

50 calories per gram

Solution

Question 2

Only (i) is correct.

Only (i) and (ii) are correct.

Only (ii) is correct.

All are correct.

Solution

Question 3

In a pressure cooker at sea level

In a pressure cooker at higher altitudes

In an open vessel at sea level

In an open vessel at higher altitudes

Solution

Question 4

Both (A) and (R) are correct and (R) is the right explanation of (A).

Both (A) and (R) are correct, but (R) is not the right explanation of (A).

(A) is correct and (R) is incorrect.

(A) is incorrect and (R) is correct.

Solution

Question 5

have low freezing points

have weak intermolecular forces of attraction

cannot be ionic compounds

have low vapour pressures

Solution

Question 6

Charles' law

Graham's law

Boyle's law

diffusion

Solution

Question 7

5 g of H2 (g)

5 L of methane (g)

5 moles of O2 (g)

5 × 1023 molecules of CO2 (g)

Solution

Question 8

Potassium permanganate

Copper sulphate

Sulphur dioxide

Solid carbon dioxide

Solution

Question 9

melting point or freezing point

boiling point or freezing point

boiling point or melting point

boiling point or point of condensation

Solution

User

Question Analysis

My Perfomance

Score

-

Rank

-

Results Announcement on: coming Monday

Stay Tuned: We’ll update you on your result via email or SMS.

5 g of H₂(g)

5 moles of O₂ (g)

5 × 10²³ molecules of CO₂(g)