UPSC  >  Test: Physics - 3

# Test: Physics - 3

Test Description

## 20 Questions MCQ Test Science & Technology for UPSC CSE | Test: Physics - 3

Test: Physics - 3 for UPSC 2023 is part of Science & Technology for UPSC CSE preparation. The Test: Physics - 3 questions and answers have been prepared according to the UPSC exam syllabus.The Test: Physics - 3 MCQs are made for UPSC 2023 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for Test: Physics - 3 below.
Solutions of Test: Physics - 3 questions in English are available as part of our Science & Technology for UPSC CSE for UPSC & Test: Physics - 3 solutions in Hindi for Science & Technology for UPSC CSE course. Download more important topics, notes, lectures and mock test series for UPSC Exam by signing up for free. Attempt Test: Physics - 3 | 20 questions in 20 minutes | Mock test for UPSC preparation | Free important questions MCQ to study Science & Technology for UPSC CSE for UPSC Exam | Download free PDF with solutions
 1 Crore+ students have signed up on EduRev. Have you?
Test: Physics - 3 - Question 1

### Consider the following statements and select the correct code. Assertion (A): In our houses, the current in A.C. electricity line changes direction 60 times per second. Reason (R): The frequency of alternating voltage supplied is 50 Hz.

Detailed Solution for Test: Physics - 3 - Question 1

In our houses, the frequency of alternating voltage supplied is 50 Hz, i.e. 50 times per second. In America, frequency of A.C. line is 60 Hz.

Test: Physics - 3 - Question 2

### Consider the following statements: 1. If magenta and yellow-coloured circles intersect, the intersected area will have red colour." 2. If cyan and magenta coloured circles intersect, the intersected area will have blue colour. Q. Which of the statement(s) given above is/are correct?

Detailed Solution for Test: Physics - 3 - Question 2

The intersected area of magenta and yellowcoloured circles will have red colour. The intersected area of cyan and magenta coloured circles will have blue colour. Magenta = Red + Blue Cyan = Blue + Green

Test: Physics - 3 - Question 3

### Consider the following statements: 1. A flute of smaller length produces waves of lower frequency. 2. Sound travels in rocks in the form of longitudinal elastic waves only. Q. Which of the statement(s) given above is/are correct?

Detailed Solution for Test: Physics - 3 - Question 3

Sound travels in rocks in the form of longitudinal elastic waves only.

Test: Physics - 3 - Question 4

Which of these pairs has the same unit of measurement?

Detailed Solution for Test: Physics - 3 - Question 4

Pressure and Coefficient of Elasticity have the same unit i.e. Nm-2 (Newton per metre square) Other important units: Rate of Flow: m3s-1 Acceleration: ms-2 Rydberg constant: 1/m Gas constant: J/K Impulse: Ns Moment of Force: Nm

Test: Physics - 3 - Question 5

Match List-I with List-II and select the correct answer using the codes given below:

Detailed Solution for Test: Physics - 3 - Question 5

Joule denoted by coulomb–volt. Watt denoted by amp2–ohm. Volt denoted by henery–amp/sec. Coulomb denoted by farad–volt.

Test: Physics - 3 - Question 6

Which of the following statements are true regarding heat?
1. Heat is a form of energy.
2. Heat can be reflected by mirror.
3. Heat is an electromagnetic radiation.
4. Heat can pass through a vacuum.
Q. Select the correct answer from the codes given:

Detailed Solution for Test: Physics - 3 - Question 6

Heat is a form of energy. Heat can be reflected by mirror. Heat can pass through a vacuumHeat is transferred by thermal radiation. Heat cannot conduct through a vacuum because that requires molecules to move to carry the thermal energy.

Test: Physics - 3 - Question 7

Ultrasonic waves are used for stirring liquid solutions because they

Detailed Solution for Test: Physics - 3 - Question 7

Ultrasonic waves can produce perfectly homogeneous solution. It is used in homogenising milk cosmetics, etc.

Test: Physics - 3 - Question 8

According to the modern theory of nature of light, the light has

Detailed Solution for Test: Physics - 3 - Question 8

According to the modern theory of nature of light, the light has both wave and particle nature.

Test: Physics - 3 - Question 9

According to Coulomb’s law, the electrostatic force between two charges is

Detailed Solution for Test: Physics - 3 - Question 9

The electrostatic force between two charges is inversely proportional to the square of the distance between the charges.

Test: Physics - 3 - Question 10

What is the difference between a CFL and an LED lamp?
1. To produce light, a CFL uses mercury vapour and phosphorus while an LED lamp uses semiconductor material.
2. The average lifespan of a CFL is much longer than that of LED lamp.
3. A CFL is less energy - efficient as compared to an LED lamp.

Q. Which of the statement(s) given above is/are correct?

Detailed Solution for Test: Physics - 3 - Question 10

To produce light, a CFL uses mercury vapour and phosphorus while an LED lamp uses semiconductor material.

Test: Physics - 3 - Question 11

Heavy water is used as a moderator in a nuclear reactor. The function of the moderator is

Detailed Solution for Test: Physics - 3 - Question 11

The function of the moderator is to slow down the neutrons.

Test: Physics - 3 - Question 12

What does the term Dolby B or Dolby C printed on tape recorders and other sound systems refer to?

Detailed Solution for Test: Physics - 3 - Question 12

The term Dolby B or Dolby C printed on tape recorders and other sound systems refers to noise reduction circuit.

Test: Physics - 3 - Question 13

A man inside an artificial satellite feels weightlessness because the force of attraction due to earth is

Detailed Solution for Test: Physics - 3 - Question 13

A man inside an artificial satellite feels weightlesness because the force of attraction due to earth i.e. g (= acceleration due to gravity) is zero.

Test: Physics - 3 - Question 14

A liquid drop tends to assume a spherical shape because of

Detailed Solution for Test: Physics - 3 - Question 14

Due to the surface tension, a liquid drop tends to assume a spherical shape to minimise the surface area.

Test: Physics - 3 - Question 15

The freezer in a refrigerator is located at the top section so that

Detailed Solution for Test: Physics - 3 - Question 15

Because of the entire chamber of the refrigerator is cooled quickly due to convection.

Test: Physics - 3 - Question 16

Consider the following statements and select the correct code.
Assertion (A): The velocity of sound in air increased due to the presence of moisture in it.
Reason (R): The presence of moisture in air lowers the density of air.

Detailed Solution for Test: Physics - 3 - Question 16

The velocity of sound in air increases as the humidity increases.

Test: Physics - 3 - Question 17

Which of the following properties is not possible in case of X-rays?

Detailed Solution for Test: Physics - 3 - Question 17

Due to high penetrating power, the properties of interference, diffraction and polarization are not possible in X-ray.

Test: Physics - 3 - Question 18

Which of the following is not correctly matched?

Detailed Solution for Test: Physics - 3 - Question 18

Galvanometers are electrical devices used for the detection or measurement of the electric currents

Test: Physics - 3 - Question 19

If alpha, beta and gamma rays carry same momentum, which has the longest wavelength?

Detailed Solution for Test: Physics - 3 - Question 19

When alpha, beta and gamma rays carry same momentum, then all have same wavelength as λ = h / P  where λ = wavelength, P = momentum and h = Plank’s constant (= 6.62 × 10– 34 Js).

Test: Physics - 3 - Question 20

Consider the following statements :
The fraction of a ball floating inside the liquid depends upon
1. density of the liquid
2. mass of the ball
3. density of the ball

Q. Which of the statements given above are correct?

Detailed Solution for Test: Physics - 3 - Question 20

The fraction of a ball floating inside the liquid depends only upon density of the liquid and the ball.

## Science & Technology for UPSC CSE

86 videos|352 docs|235 tests
 Use Code STAYHOME200 and get INR 200 additional OFF Use Coupon Code
Information about Test: Physics - 3 Page
In this test you can find the Exam questions for Test: Physics - 3 solved & explained in the simplest way possible. Besides giving Questions and answers for Test: Physics - 3 , EduRev gives you an ample number of Online tests for practice

## Science & Technology for UPSC CSE

86 videos|352 docs|235 tests

### How to Prepare for UPSC

Read our guide to prepare for UPSC which is created by Toppers & the best Teachers

### Download free EduRev App

Track your progress, build streaks, highlight & save important lessons and more!