Question

4. (a) What do you mean by free fall? [3]
(b) A stone is released from the top of a tower of height 19.6 m. Then calculate its final velocity
just before touching the ground. ( Take g = 9.8 m/s2
)
CHEMISTRY (8)
5. Write one point each of difference and similarity between proton and neutron. (1m)
6. Look at the table and write ‘a’to‘d’ in the answer sheet correctly. (do not copy the table) (2m)
YEAR NAME DISCOVERY
1932 ‘a’ Neutron
1900 JJ Thomson ‘b’
‘c’ E. Goldstein Canal rays
1911 ‘d’ Nucleus of an atom
7. (2m)
(a) This element has 13 electrons
and is used in the packing of food
due to its malleability. Give the
correct name of it and sketch the
model showing its electrons
arranged in the shells (orbits)
around the nucleus.
(b) Here is a model of an element used in swimming
pools and disinfecting the drinking water. Write its
Name and its symbol given in textbook.
8. Tabulate one salient point of the EACH model of an atom given by the three greats – JJ
Thomson, E. Rutherford and Neils Bohr and sketch the model given by each one of them.
(Hint: Use E. Rutherford’s points of model to sketch his model of an atom) (3m)
BIOLOGY (9)
9. Name the bacterium that causes Peptic ulcers (1m)
10. Rajiv celebrates his 40th birthday with his five friends at McDonald’s. Unfortunately,
one of his friend falls ill and goes for RT-PCR test and is found to be Covid-19 positive.
Write the causes of the disease at different level/category viz- immediate, secondary or
contributory causes. (1m)
11. Categorize the following diseases as infectious and non-infectious diseases. (2m)
AIDS, Cholera, High blood pressure, Pneumonia
12. What are chronic diseases? Explain the impact they have on one’s health. (2m)
13. Define the terms ‘health’ and “disease.” (3m)
How will the doctor diagnose your illness when you go to the clinic?

Answer 1

Answer:

A free fall happens when gravity of an object almost become 0°.