CBSE Class 9 - Physics - Density, Buoyancy and Archimedes' Principle (Assignment) (#cbseNotes)

Density, Buoyancy and Archimedes' Principle (Assignment)

1. When we stand on loose sand, our feet go deep into the sand. But when we lie down on the sand our body does not go that deep in the sand. Why ?

2. Define relative density of a substance. Relative density of silver is 10.8. The density of water is 1000 kg/m³ What is the density of silver in SI units?

3. A cork floats in water, while the iron nail sinks. Give reason. (2)

4. State Archimedes' Principle. Based on this principle, write its two applications. (2)

5. (i) Define pressure. (2)
(ii) Why is it easy to walk on sand with flat shoes, than with high heel shoes?

CBSE Class 10 -Chemistry - Metals and Non-Metals (Short Q and A)(#cbseNotes)

Metals and Non-Metals (Short Q and A)

Q1: Define Element.

Answer: An element is a pure substance which is made up of same kind of atom which differs from their physical and chemical properties.


Q2: How many elements are known so far? How many of them are naturally occurring?

Answer: 118 under which 92 are naturally occurring.


Q3: Give examples of the most abundant elements.

Answer: Aluminium ( the most) and Iron


Q4: Which is the most abundant non-metal?

Answer: Oxygen (O)


Q5: Give examples of the least reactive metals.

Answer:
• Gold
• Silver
• Platinum

CBSE Class 9 - Science - Mid Term Examination Paper (2017-18) (#cbsePapers)

CBSE Class 9 - Science - Mid Term Examination Paper  (2017-18)

CBSE Class 8 - Science - Half Yearly Sample Question Paper (2017-18) (#cbsePapers)

SCIENCE SAMPLE PAPERHALF YEARLY ASSESSMENT (2017-18)CLASS - VIII

TIME-3 hrs                                                                                                    MM-80 Marks

GENERAL INSTRUCTIONS:-
1. All questions are compulsory.
2. This paper contains 4 sections: namely SECTION A- Physics, SECTION B-Chemistry,
SECTION C- Biology and SECTION D- MCQ
3. Please attempt the questions in serial order.

SECTION A (PHYSICS)

Q1. Fill in the blanks                                        (1x7= 7)
a) If light bends towards the normal as it goes from media A to medium B, then medium A is optically ______ than medium B.

b) For a normal eye, the ________ point is infinity.

c) A ______ is an instrument used in submarines to view objects on the surface of the sea.

d) The ______ constellation forms the shape of a hunter.

e) ______ was the first satellite sent up from the earth.

f) The galaxy we live in is called the __________.

g) ______ is the distance between the optical centre and the focus of a lens.

CBSE Class 9 - Hindi - Half Yearly Examination Paper Set 1 (2017-18)हिंदी (अर्ध वार्षिक परीक्षा २०१७-१८)

CBSE Class 9 - Hindi - Half Yearly Examination Paper Set 1  (2017-18)हिंदी (अर्ध वार्षिक परीक्षा २०१७-१८)   

Class 9 - हिंदी (अर्ध वार्षिक परीक्षा २०१७-१८) प्रश्न पत्र :

CBSE Class 10 - Biology - - Arteries vs Veins (#cbseNotes)

Biology - Arteries vs Veins

Areteries vs Veins
credits: Kelvinsong (Wikimedia) under CC-BY-SA-3.0

Arteries and Veins are parts of closed circulatory system and both carry blood. Here follows the differences between the two:

CBSE Class 8 - Hindi - Half Yearly Examination Paper Set 2 (2017-18) हिंदी (अर्ध वार्षिक परीक्षा २०१७-१८) (#cbsePapers)

CBSE Class 8 - Hindi - Half Yearly Examination Paper Set 2  (2017-18)हिंदी (अर्ध वार्षिक परीक्षा २०१७-१८)   

Class 8 - हिंदी (अर्ध वार्षिक परीक्षा २०१७-१८) प्रश्न पत्र :