Sample Paper: Term-1:2021-22 - Class 10th Science

Science Term-1 MCQs:F

Question (51) What is the saturated solution of Sodium Chloride called?

(A) Brine

(B) Lime water

(C) Slaked lime

(D) Soda water

Answer (A) Brine

Explanation

The saturated solution of Sodium Chloride is called Brine.

Thus, the correct answer is (A) Brine

Question (52) 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

Answer (A) Between 1 to 3

Explanation

Sodium chloride is known as common salt. Sodium chloride is formed when sodium hydroxide reacts with hydrochloric acid.

HCl + NaOH ⇒ NaCl + H₂

Hydrochloric acid is a strong acid. Thus, its pH value would be between 1 to 3.

In option (B) the pH value is between 6 to 8.

Acids having pH value equal to 6 are considered very weak acid, while solution having pH value equal to 7 is called distilled water, and solution having pH value equal to 8 is considered as a weak base.

So, option (B) is not correct.

In other options the range of pH values denotes bases. Hence, other options are also not correct.

Thus, the correct answer is option (A) Between 1 to 3

Case

The haemoglobin level is expressed as the amount of haemoglobin in grams (gm) per deciliter (dL) of whole blood, a deciliter being 100 milliliters.

The normal range for hemoglobin depend on the age and gender of the person.

The normal ranges are:

New borns: 17 to 22 gm/dL

One (1) week of age: 15 to 20 gm/dL

One (1) month of age: 11 to 15 gm/dL

Children: 11 to 13 gm/dL

Adult males:14 to 18 gm/dL

Adult women: 12 to 16 gm/ dL

Men after middle age: 12.4 to 14.9 gm/dL

Women after middle age: 11.7 to 13.8 gm/dL.

Question (53) Which of the following components of blood has hemoglobin in it?

(A) Platelets

(B) White blood cells

(C) Red blood cells

(D) All of them

Answer (C) Red blood cells

Explanation

Haemoglobin is the iron containing oxygen transport metalloprotein found in the red blood cells.

Thus, the correct answer is option (C) Red blood cells.

Question (54) Which is not true about Hemoglobin?

(A) It is a respiratory pigment.

(B) It has a high affinity for oxygen and carbon dioxide.

(C) It is present in RBCs

(D) Its deficiency causes anaemia.

Answer (A) It is a respiratory pigment.

Explanation

Heamoglobin is found in the red blood cells. It has a high affinity for oxygen and carbon dioxide. Anaemia is a disease which is generally termed as blood deficiency caused by the deficiency of haemoglobin.

Thus, the correct answer is option (A) It is a respiratory pigment.

Question (55) The blood leaving the tissues become richer in

(A) Hemoglobin

(B) Glucose

(C) Oxygen

(D) Carbon Dioxide

Answer (D) Carbon Dioxide

Explanation

Blood leaving the tissues carry carbon dioxide to the lungs so that it can be oxidized again. So, blood leaving the tissues become richer in carbon dioxide.

Thus, the correct answer is option (D) Carbon dioxide

Question (56) Which of the following gases is carried by hemoglobin in our body?

(A) Ozone

(B) Nitrogen

(C) Oxygen

(D) Hydrogen

Answer (C) Oxygen

Explanation

It is the haemoglobin which is responsible to carry oxygen taken from lungs while breathing to all parts of body.

Thus, the correct answer is option (C) Oxygen

Case

Ravi took four transparent glasses and filled individual glasses with different liquids. In the first glass he poured water, in the second glass he poured ethanol (paint thinner), in the third glass he poured kerosene and in the fourth glass he poured Turpentine oil.

Then he dipped pencils in each glass to investigate his own doubts regarding the bending of light on the basic of his observations and the previous knowledge he had.

Question (57) Ravi made some assumptions on the basis of his observations which are as follows:

(P) Bending of pencil is more in ethanol w.r.t. bending of pencil in turpentine oil.

(Q) Bending of pencil in water is least.

(R) Bending of pencil is less in ethanol w.r.t. bending of pencil in kerosene

(S) Bending of pencil is more in kerosene w.r.t Bending of pencil in turpentine oil.

Which statements are correct

(A) P

(B) S

(C) Q and S

(D) Q and R

Answer (D) Q and R

Explanation

The speed of light decreases in denser medium. Denser medium has greater refractive index.

Here, the refractive index of water is least as given in the table. And refractive index of ethanol is less than that of kerosene.

So, the option (Q) Bending of pencil in water is least and option (R) Bending of pencil is less in ethanol w.r.t. bending of pencil in kerosene are correct

Thus, the correct answer is option (D) Q and R

Question (58) Calculate the relative refractive index of kerosene w.r.t water.

(A) 0.92

(B) 1.32

(C) 1.08

(D) 0.62

Answer (A) 0.92

Explanation

We know that, refractive index of medium

Refractive index of medium 2 with respect to medium 1

Thus, refractive index of kerosene with respect to water

Thus, the correct answer is option (A) 1.08

Question (59) Speed of light in kerosene is:

(A) 0.48 × 10 8 m/s

(B) 2.08 × 10 8 m/s

(C) 2.18 × 10 8 m/s

(D) 48 × 10 8 m/s

Answer

Refractive index of medium 2 with respect to medium 1

Thus, refractive index of kerosene with respect to light

Velocity of light in kerosene = 2.08 × 10⁸ m/s

Thus, the correct answer is option (B) 2.08 × 10⁸ m/s

Question (60) The relative refractive index of turpentine oil w.r.t water is given by:

(A) The ratio of R.I of water to the R.I of turpentine oil

(B) The ratio of R.I of turpentine oil to the R.I of water

(C) The ratio of velocity of light in water to the velocity of light in turpentine oil

(D) both (B) and (C)

Answer (D) both (B) and (C)

Explanation

We know that, when velocity of light in two media are given, then Refractive Index of medium 2 with respect to medium 1

When Refractive Index of two media are given, then Refractive Index of medium 2 with respect to medium 1

Thus, Refractive index of turpentine oil w.r.t. water is given by

And, Refractive index of turpentine w.r.t. water is given by

Thus, the correct options are (B) The ratio of RI of turpentine oil to the RI of water and (C) The ratio of velocity of light in water to the velocity of light in turpentine oil

Thus, the correct answer is option (D) Both (b) and (c)

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