ICSE Physics Competency Questions

Assertion (A): When light passes through a triangular prism, it is observed that for two angles of incidence, the angle of deviation is the same.

Reason (R): According to the principle of reversibility, the light retraces the path in reversing the direction.

• A and R are true, and R is the reason for A.

• A and R are true, and R is not the reason for A.

• A is true, but R is false.

• A is false, but R is true.

During his experiments with a single movable pulley, Jas determined the effort, mechanical advantage and efficiency as X, Y & Z, respectively. Subsequently, after lubricating the pulley thoroughly, he recalculated the effort, MA and efficiency. X', Y' & Z' respectively. Which of the following relationships accurately represents the scenario?

• X’> X

• Y’< Y

• Z’> Z

• Z’ = Z

Assertion: For a glass block, the i vs. r graph is a straight line.

Reason: When a ray of light undergoes refraction, it follows Snell's law.

• Both Assertion and Reason are true, and the Reason is the correct explanation of the Assertion.

• Both Assertion and Reason are true, but Reason is not the correct explanation of the Assertion.

• Assertion is true, but the Reason is false.

• Assertion is false, but the Reason is true.

________ of UV > ________ of microwaves The quantity suitable for filling in both the blanks is:

• speed in vacuum

• speed in a medium

• frequency

• wavelength.

Data: mass =10g quantity of heat supplied =120J rise in temperature = 10 0 C

STATEMENT A: The heat capacity of the substance is 12 J/g.

STATEMENT B: The specific heat capacity of the substance is 1.2 J/gK.

• Only statement A is correct.

• Only statement B is correct.

• Both statements A and B are correct.

• Both statements A and B are incorrect.

Given that the resistivity of Gold and Platinum is 2.1x10 -8 ohm m and 10.5x10 -8 ohm m, respectively, which is the correct statement?

STATEMENT A: 5 metres of platinum wire will have the same resistance as one metre of gold wire. STATEMENT B: Gold wire of 1cm radius will have the same resistance as platinum wire of 5cm radius.

• Only statement A is correct.

• Only statement B is correct.

• Both statements A and B are correct.

• Both statements A and B are incorrect.

Assertion: A switch will serve the purpose of making and breaking a circuit when it is connected to the neutral wire.

Reason: Neutral wire is at zero potential.

• Both Assertion and Reason are true, and the Reason is the correct explanation of the Assertion

• Both Assertion and Reason are true, but Reason is not the correct explanation of the Assertion

• Assertion is true, but the Reason is false.

• Both Assertion & Reason are false.

Three metals, A, B and C, are supplied with the same quantity of heat. Their masses are in the ratio 2:3:4. If they show the same rise in the temperature, then the ratio of their thermal capacities will be:

• 1:1:1

• 4:3:2

• 2:3:4

• 2:3:1

A magnetic compass is present on a small table, very close to the wall in a room. A man enters the room and switches on the Air Conditioner fitted near the ceiling. He observes that the needle in the compass shows immediate deflection. Identify the most probable reason for the deflection.

• Air blowing in the room.

• Current starts flowing through AC wire concealed in the adjacent wall.

• Vibrations are produced when the Man starts talking to his wife in the kitchen.

• Vibrations were produced due to a file in his hand that fell on the ground.

Two substances, A and B, have the same mass. Substance A has a higher specific heat capacity than substance B. What consequences would you expect when these substances are subjected to the same amount of heat energy?

• Substance A will experience a smaller temperature change than substance B.

• Substance A will experience a larger temperature change than substance B.

• Both substances will experience the same temperature change.

• Either of them can show a greater change in temperature as the temperature change depends on factors other than specific heat capacity.