light, heat, thermodynamics, wave motion, sound, optics & oscillations - Category wise Question and Answer Practice Test with Solutions

light, heat, thermodynamics, wave motion, sound, optics & oscillations PRACTICE TEST [16 - EXERCISES]

set 1

set 2

set 3

set 4

set 5

set 6

set 7

set 8

set 9

set 10

set 11

set 12

set 13

set 14

set 15

set 16

Question : 21

Flash light equipped with a new set of batteries, produces bright white light. As the batteries wear out

a) it stops working suddenly while giving white light

b) the light intensity gets reduced with no change in its colour

c) light colour changes first to yellow and then red with no change in intensity

d) colour changes to red and also intensity gets reduced

Discuss »

Answer: (d)

As the batteries wear out the energy supplied to the flash light becomes less so colour changes to red and intensity gets reduced as red colour has larger wavelength and less frequency, so less intensity.

Question : 22 [PSC (Pre) 2018]

Sound waves travel fastest in

a) Liquids

b) Gases

c) Solids

d) Vacuum

Discuss »

Answer: (c)

Question : 23 [PSC (Pre) 2018]

Given below are two statements, one labelled as Assertion (A) and other labelled as Reason (R).
Assertion (A):
A diamond sparkles more than a glass imitation cut to the same shape.
Reason (R):
The refractive index of diamond is less than that of glass.
In the context of the above two statements, which one of the following is correct?

a) (A) is true, but (R) is false

b) Both (A) and (R) are true, but (R) is not the correct explanation of (A)

c) Both (A) and (R) are true and (R) is the correct explanation of (A)

d) (A) is false, but (R) is true

Discuss »

Answer: (a)

Question : 24 [RAS/RTS (Pre) 2012]

The optimum sound level for human beings is

a) 60 dB

b) 120 dB

c) 90 dB

d) 100 dB

Discuss »

Answer: (a)

Question : 25

A hollow sphere is filled with water. It is hung by a long thread. As the water flows out of a hole at the bottom, the period of oscillation will

a) go on increasing

b) first increase and then decrease

c) first decrease and then increase

d) go on decreasing

Discuss »

Answer: (b)

The time period of simple pendulum T = 2π$√(l/g) ∝ √{l}$ where l is effective length. [i.e distance between the centre of suspension and centre of gravity of bob] Initially, the centre of gravity is at the centre of the sphere.

When water leaks the centre of gravity goes down until it is half filled; then it begins to go up and finally it again goes to the centre. That is effective length first increases and then decreases.

As T$∝ √l$, so time period first increases and then decreases.

IMPORTANT general science mcq EXERCISES

set 12 Online Quiz

Click to Start..
1650 heat wave motion sound optics oscillations based general science mcq set 12 question answer pdf
general science mcq CATEGORIES
RECENT BLOGS
SSC CHSL Exam Centres 2023 Tier 1 & 2: State-Wise Apply Link
SSC CHSL Exam Centres 2023 Tier 1 & 2: State-Wise Apply Link Read more...
SSC CHSL 2023 Tier 2: Syllabus PDF & Exam Pattern [Changed]
SSC CHSL 2023 Tier 2: Syllabus PDF & Exam Pattern [Changed] Read more...
SSC CHSL Tier 1 Revised Syllabus 2023 & New Topics List PDF
SSC CHSL Tier 1 Revised Syllabus 2023 & New Topics List PDF Read more...
SSC CHSL 2023 Tier 2 New Revised Exam Pattern & Syllabus PDF
SSC CHSL 2023 Tier 2 New Revised Exam Pattern & Syllabus PDF Read more...

Recently Added Subject & Categories For All Competitive Exams

Classification Reasoning MCQ For IBPS Clerk Prelims 2024

Most Important 100+ Classification based Verbal Reasoning Ability Multiple choice questions and answers PDF, Free New Mock tests For IBPS Clerk Prelims 2024

03-May-2024 by Careericons

Continue Reading »

Ratio and Proportion Questions with Solutions, IBPS Clerk

New Ratio and Proportion Quants Aptitude based Multiple Choice Questions and Answers Practice Test Series, Quiz & Mock Test for IBPS Clerk Prelims 2024 Exam

02-May-2024 by Careericons

Continue Reading »

Top Analogy Reasoning Ability For IBPS Clerk Prelims 2024

Most Important Analogy based Verbal Reasoning Multiple choice questions and answers practice quiz series PDF, Free New Mock tests For IBPS Clerk Prelims 2024

01-May-2024 by Careericons

Continue Reading »

SSC STENO: Mensuration Area & Volume Questions Test PDF

Free Mensuration Area and Volume Aptitude-based Practice multiple questions with solutions, Quiz, Full Mock Test & PDF for SSC Steno (Grade C & D) 2024 Exam

30-Apr-2024 by Careericons

Continue Reading »