Question 1 :
A student sitting at the back of the classroom cannot read clearly the letters written on the blackboard. What advice will a doctor give to her?

Question 2 :
Advantage associated with water harvesting at the community level: The water can be stored during rainy season and can be used when required. State TRUE or FALSE.

Question 4 :
What steps would you suggest to minimise environmental pollution caused by burning of fossil fuels?

Question 5 :
<img style='object-fit:contain' src='https://teachmint.storage.googleapis.com/question_assets/cbse_ncert/61b19d0c273b230584979b8e.jpg' /> In the above image, there are two coils wound on a non-conducting cylindrical rod. Initially the key is not inserted. Then the key is inserted and later removed. Comment about the arrangement.

Question 6 :
State TRUE or FALSE. Producers prepare their own food from inorganic compounds

Question 7 :
Identify the type of reaction Limestone is heated strongly to form quicklime and carbondioxide gas is evolved

Question 9 :
'Nutrition' is a necessity for an organism. State TRUE or FALSE.

Question 10 :
The flow of signals in a synapse is from axonal end of one neuron to dendritic end of another neuron. Can it be reversed?

Question 11 :
A magnetic compass shows a deflection when placed near a current carrying wire. The deflection of the compass get affected if the current in the wire is increased. State TRUE or FALSE.

Question 12 :
Offspring formed as a result of sexual reproduction exhibit more variations because ?

Question 13 :
Sudha finds out that the sharp image of the window pane of her science laboratory is formed at a distance of 15 cm from the lens. She now tries to focus the building visible to her outside the window instead of the window pane without disturbing the lens. What is the approximate focal length of this lens ?

Question 14 :
In the context of conservation of natural resources, explain the term reuse.

Question 15 :
<img style='object-fit:contain' src='https://teachmint.storage.googleapis.com/question_assets/cbse_ncert/61b19d04273b230584979b85.jpg' /> In the above image, current flowing through 4 Ω resistor in Ampere is ?

Question 16 :
How many times does AC used in India change direction in one second?

Question 17 :
How will you use two identical prisms so that a ray of white light incident on one prism emerges out of the second prism as white light?

Question 18 :
In human beings, the statistical probability of getting either a male or female child is 50 : 50. State TRUE or FALSE.

Question 19 :
Which one of the following four metals would be displaced from the solution of its salt by other three metals?

Question 20 :
Identify the type of reaction: Nitrogen gas is treated with hydrogen gas in the presence of a catalyst at 773 K to form ammonia gas.

Question 21 :
Sudha finds out that the sharp image of the window pane of her science laboratory is formed at a distance of 15 cm from the lens. She now tries to focus the building visible to her outside the window instead of the window pane without disturbing the lens. In which direction will she move the screen to obtain a sharp image of the building?

Question 22 :
<img style='object-fit:contain' src='https://teachmint.storage.googleapis.com/question_assets/cbse_ncert/61b19d07273b230584979b88.jpg' /> In the above image, what will the difference in ammeter readings?

Question 23 :
<img style='object-fit:contain' src='https://teachmint.storage.googleapis.com/question_assets/cbse_ncert/61b19d0b273b230584979b8d.jpg' /> In the above image, the resistance between A and B will be ?

Question 25 :
Salt A commonly used in bakery products on heating converts into another salt B which is used in the manufacture of glass and a gas C is evolved. The gas C when passed through lime water, turns it milky. Identify B.