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Question: Choose the correct statements. (A) Weight of a substance is the amount of matter present in it. (B...

Choose the correct statements.

(A) Weight of a substance is the amount of matter present in it.

(B) Mass is the force exerted by gravity on an object.

(C) Volume is the amount of space occupied by a substance.

(D) Temperatures below 0°C are possible in Celsius scale, but in Kelvin scale negative temperature is not possible.

(E) Precision refers to the closeness of various measurements for the same quantity.

Choose the correct answer from the options given below :

A

(A), (D) and (E) Only

B

(C), (D) and (E) Only

C

(A), (B) and (C) Only

D

(B), (C) and (D) Only

Answer

B

Explanation

Solution

Here is the analysis of each statement:

(A) Weight of a substance is the amount of matter present in it. Incorrect. The amount of matter present in a substance is called mass. Weight is the force exerted by gravity on the mass of an object (Weight = mass × acceleration due to gravity).

(B) Mass is the force exerted by gravity on an object. Incorrect. This statement defines weight, not mass. Mass is an intrinsic property of a substance, while weight is dependent on the gravitational field.

(C) Volume is the amount of space occupied by a substance. Correct. Volume is a measure of the three-dimensional space occupied by matter.

(D) Temperatures below 0°C are possible in Celsius scale, but in Kelvin scale negative temperature is not possible. Correct. The Celsius scale is defined such that 0°C is the freezing point of water, and temperatures can be negative (e.g., -10°C). The Kelvin scale is an absolute temperature scale where 0 K represents absolute zero, the lowest theoretically possible temperature. Therefore, negative temperatures are not possible on the Kelvin scale.

(E) Precision refers to the closeness of various measurements for the same quantity. Correct. Precision indicates the reproducibility of measurements, i.e., how close multiple measurements of the same quantity are to each other. Accuracy, on the other hand, refers to how close a measurement is to the true value.

The correct statements are (C), (D), and (E).