CBSE Class9 - Science - CH11 - Work and Energy

WORK AND ENERGY

NCERT Solutions and Q & A


Q1: A roller coaster is shown in figure, at points i.e. ➊ and ➋, comparatively at what point 
(i) potential energy is maximum
(ii) kinetic energy  is maximum

Answer: At point ➊, comparatively kinetic energy will be maximum and at point ➋ potential energy will be maximum.

Science & Technology Objective Test (Haryana Board)/NTSE Science Quiz-17

Science & Technology Objective Test

(Haryana Board)

NTSE Science Quiz-17

Q1: The speed of light in vacuum is

(a) 3 ×10⁸ m/s
(b) 3 ×10¹⁰ m/s
(c) 3 ×10⁵ m/s
(d) Zero

Q2: The angle of incidence for a ray of light is 45°. The angle of Reflection will be:

(a) 90°
(b) 45°
(c) 180°
(d) 0°

English Grammar Quiz - Cries of Animals and Birds

English Grammar Quiz - Cries of Animals and Birds

Choose the right word  from the given options which correctly expresses the cry of the animal or bird.

Q1: Horses

(a) bleat
(b) neigh
(c) howl
(d) squeak

Q2: Frogs

(a) squeal

(b) croak
(c) grunt
(d) cluck

CBSE Class 8 - Science - CH13 - Sound

Sound

loud music can seriously
damage your ears
image credits:openclipart

(NCERT Chapter Answers)

Q1. Choose the correct answer :
       Sound can travel through
        (a) gases only
        (b) solids only
        (c) liquids only
        (d) solids, liquids and gases.

Answer: (d) Sound can travel through solids, liquids, and gases as it requires a medium to travel through. Solid, liquid and gas provide the medium for sound to travel. Sound cannot travel in vacuum.

The Fox and The Crow Story in Sanskrit (लोमश: एवं काक:)

story-1                       लोमश: एवं काक:

एकस्य काकस्य मुखे रोटिका आसीत । स: वृक्षस्य उपरि शाखायां अतिष्ठत् | तत: एक: लोमश: तत्र आगच्छत | लोमश: काकस्य मुखे रोटिकां दृष्टवा अचिन्तयत् यदि ऐष: मुखम् विवृन्त करोति तदा अस्य रोटिका नीचै: पतिष्यति , अहं च खादिष्यामि |  

स: उच्चै: मुखम् कृत्वा वदति, " हे काक ! त्वं तु अति सुन्दर: असि | तव स्वर: अपि मधुर: भवेत् |"  

CBSE Class 9 - Science - CH3 - Atoms and Molecules (Worksheet)

Atoms and Molecules (Worksheet)

Water Molecule

Fill in the blanks

1. An element has only one type of __________.

2. According to law of definite proportions, in a chemical substance the elements are always present in __________ proportions by mass.

3. According to Dalton's atomic theory, atoms of different elements differ in ______, size and chemical properties.

4. The chemical symbol of flourine is ________.

5. The chemical symbol of mercury is _________.

CBSE Class 7 - Science - CH16 - Water: A Precious Resource

Water: A Precious Resource

Save Water
credits:openclipart

NCERT Solutions, Q & A

Q1: When 'World Water Day' is celebrated?

Answer: March 22nd.

Q2: What is the main objective of celebrating 'Water Day'?

Answer: We celebrate water day every year to attract the attention of everybody towards the
importance of conserving water.

Q3: How much much amount of water is recommended by UN for daily use by a person?

CBSE Class 9 - English PSA Worksheet

English - PSA Worksheet

(Questions asked in one of  the public school at Delhi. PSA stands for Problem Solving Assessment, a test to be conducted by schools as per CBSE guidelines)



Tick (✓) the right option to fill in the blanks:

Q1: A crowd gathered to watch the _________ of ships in the harbour.

(a) band
(b) pack
(c) fleet
(d) crew

Class 9 - Maths - PSA Sample Test Paper/NTSE MAT Quiz-16

Class 9 - Maths - PSA Sample Test Paper

NTSE MAT Quiz-16

(Questions asked in one of  the public school at Delhi. PSA stands for Problem Solving Assessment, a test to be conducted by schools as per CBSE guidelines)

MCQs

Q1: If Rekha can type a page in 'm' minutes, what piece of the page she can do it in 10 minutes?

(a) 10/m
(b) m - 10
(c) M + 10
(d) m/10

CBSE Class 9 - English Grammar - Dialogue Completion

Dialogue Completion

Q1(CBSE 2012): Read the following conversation and complete the dialogues by choosing the correct option.

Interviewer :  (a) ___________your school ?
Raman        :  I think my school is the best school in the city.
Interviewer :  (b) _____________ in your school ?
Raman        :  Mrs Dolly Chopra is the best. She teaches us English.
Interviewer :  (c) _________ in English ?
Raman        :  I got 95 marks out of hundred
Interviewer :  (d) ____________ to your performance ?
Raman        :  I am sure she was happy.