Question 1 :
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 C.
Question 2 :
State TRUE or FALSE. Solid calcium oxide reacts vigorously with water to form calcium hydroxide accompanied by liberation of heat. This process is called slaking of lime and the pH of the resulting solution will be less than seven.
Question 3 :
Which one of the following four metals would be displaced from the solution of its salt by other three metals?
Question 4 :
What steps would you suggest to minimise environmental pollution caused by burning of fossil fuels?
Question 5 :
In the context of conservation of natural resources, explain the term reuse.
Question 6 : <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 7 :
State TRUE or FALSE. Solid calcium oxide reacts vigorously with water to form calcium hydroxide accompanied by liberation of heat. This process is called slaking of lime and the pH of the resulting solution will be more than seven.
Question 8 :
Offspring formed as a result of sexual reproduction exhibit more variations because ?
Question 9 :
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 10 :
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 A.
Question 11 : <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 13 :
How many times does AC used in India change direction in one second?
Question 14 :
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 ?
Question 15 :
Reproduction is essentially a phenomenon that is not for survival of an individual but for continuation of a species. State TRUE or FALSE.
Question 16 :
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 17 :
In the context of conservation of natural resources, explain the term reduce.
Question 18 :
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 20 :
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 21 :
The image of a candle flame formed by a lens is obtained on a screen placed on the other side of the lens. If the image is three times the size of the flame and the distance between lens and image is 80 cm, what is the nature of the lens ?
Question 22 :
Direct current always flows in one direction but the alternating current reverses its direction periodically. Is the statement given above about the difference between the direct and alternating current correct?
Question 23 : <img style='object-fit:contain' src='https://teachmint.storage.googleapis.com/question_assets/cbse_ncert/61b19d09273b230584979b8b.jpg' />
In the above image, beams of light are incident through the holes A and B and emergeout of the box through the holes C and D respectively. Which of the following could be inside the box?
Question 24 :
State TRUE or FALSE. New species may be formed if DNA undergoes significant changes in germ cells
Question 25 : <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 26 :
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 27 : <img style='object-fit:contain' src='https://teachmint.storage.googleapis.com/question_assets/cbse_ncert/61b19d08273b230584979b8a.jpg' />
In the above image, the correct sequence of anaerobic reactions in yeast is ?
Question 28 :
Sodium carbonate is a basic salt because it is a salt of ?
Question 30 : <img style='object-fit:contain' src='https://teachmint.storage.googleapis.com/question_assets/cbse_ncert/61b19d0a273b230584979b8c.jpg' />
In the above image, identify the circuit in which the electrical components have been properly connected.
Question 31 :
In the context of conservation of natural resources, explain the term recycle.
Question 32 :
State TRUE or FALSE. Solid calcium oxide reacts vigorously with water to form calcium hydroxide accompanied by liberation of heat. This process is called slaking of lime and it is an endothermic reaction.
Question 33 :
State TRUE or FALSE. Plants convert solar energy into chemical energy
Question 34 :
Three 60 W incandescent bulbs are connected in a parallel. Now suppose that one of the bulbs is fused. What will be the total power consumed now?
Question 35 : <img style='object-fit:contain' src='https://teachmint.storage.googleapis.com/question_assets/cbse_ncert/61b19d03273b230584979b84.jpg' />
In the above image, effective resistance of two 8 Ω resistors in combination in ohm is ?
Question 36 :
State TRUE or FALSE. All green plants and blue green algae are producers
Question 37 :
In human beings, the statistical probability of getting either a male or female child is 50 : 50. The sex of an infant is determined by the type of sex chromosome contributed by the male gamete. State TRUE or FALSE.
Question 38 : <img style='object-fit:contain' src='https://teachmint.storage.googleapis.com/question_assets/cbse_ncert/61b19d0d273b230584979b8f.jpg' />
In the above image, a constant current flows in a horizontal wire in the plane of the paper from east to west. The direction of magnetic field at a point will be North to South .............
Question 39 :
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 40 :
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 ?
