Top 10 Questions in ICSE Class 10 Physics Exam - 2020

Check top 10 important physics questions and answers that will help you plan your study and revision in ICSE Class 10 Physics exam - 2020

By Topperlearning Expert 09th Mar, 2020 | 06:21 pm

Physics is an important part of ICSE Class 10 examination and carries 40 marks. The paper is divided into sections 1 and 2, out of which the entire section 1 is compulsory and the section 2 has optional questions. Since it is a difficult and crucial subject, our academic experts have listed important questions for the students during their revision. These questions are jotted after extensive research and should be given importance.

Important Questions & Answers ICSE Class 10 Board Exam 2020: Physics

a. A man standing between two cliffs produces a sound and hears two successive echoes at intervals of 3 s and 4 s respectively. Calculate the distance between the two cliffs. The speed of sound in the air is 330 ms-1.
b. Why will an echo not be heard when the distance between the source of the sound and the reflecting surface is 10 m?
Solution
a.
b. Because the least distance for hearing is 17 m.
In the diagram below, A, B, C, D are four pendulums suspended from the same elastic string

PQ. The length of A and C are equal to each other while the length of pendulum B is smaller than that of D. Pendulum A is set in to a mode of vibrations. [4 M]

a. Name the type of vibrations taking place in pendulums B and D?
b. What is the state of pendulum C?
c. State the reason for the type of vibrations in pendulum B and C.

Derive a relationship between the mechanical advantage, the velocity ratio and the efficiency of a machine.

What are the necessary conditions for the total internal reflection?

A cell of e.m.f. 1.5 V and internal resistance 1.0 W is connected to two resistors of 4.0 W and 20.0 W in a series as shown in the figure drawn below: [3 M]

Calculate the:
a. Current in the circuit.
b. Potential difference across the 4.0 ohm resistor.
c. Voltage drop when the current is flowing.
d. Potential difference across the cell

b. What is meant by the earthing of an electrical appliance? Why is it essential?
b. What will be the effect on the working of an electric bell, if instead of a direct current, an alternating current is used?

A hot solid of mass 60 g at 100 °C is placed in 150 g of water at 20 °C. The final steady temperature recorded is 25 °C. Calculate the specific heat capacity of the solid. [Specific heat capacity of water = 4200 J kg-1 0C-1]

Arrange a, b, and g rays in ascending order with respect to their [3 M]
a. Penetrating power.
b. Ionizing power.
c. Biological effect.

a. What is an A.C. generator or Dynamo used for?
b. Name the principle on which it works.

Name the radiations:
a. That are used for photography at night.
b. That are used for detection of fracture in bones.

Whose wavelength ranges from 100 Å to 4000 Å (or 10 nm to 400 nm).

Review all the important answers and practice material for the ICSE Class 10 Physics exam 2020 below:

ICSE Class 10 Physics Exam 2020 - Sample Papers

ICSE Class 10 Physics Exam 2020 - Previous years papers

ICSE Class 10 Physics Exam 2020 – Most important questions

ICSE Class 10 Physics Exam 2020 – Revision notes

Important topics for your reference:

Top 10 Questions in Chemistry ICSE Class 10 Exam - 2020

7 tips for cracking the ICSE Class 10 Social Science Exam

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