Day 28: CBSE Class 10 Science

5 questions. Try each one first, then open its answer.

Question 1
Electricity. Asked 2 times: 2023*, 2025 (* = numbers or wording changed that year)
22 (b) $Prove that if the current through a resistor is increased by 100%, then the increase in power dissipated through the resistor will be 300%.$
Question 2
Electricity. Asked 2 times: 2024*, 2025 (* = numbers or wording changed that year)
22 (a) $\frac{1}{5}\,\Omega$
Question 3
Electricity. Asked 2 times: 2022*, 2025 (* = numbers or wording changed that year)
22 (b) $Two lamps, rated 100 W; 220 V and 60 W; 220 V are connected in parallel to electric main supply of 220 V. Find the current drawn by the two lamps from the supply.$
Question 4
Electricity. Asked 2 times: 2024*, 2025 (* = numbers or wording changed that year)
33 $(a) Write the relationship between resistivity and resistance of a cylindrical conductor of length l and area of cross-section A. Hence derive the SI unit of resistivity. (b) Why are alloys used in electrical heating devices ?$
Question 5
Heredity. Asked 2 times: 2022*, 2025 (* = numbers or wording changed that year)
24 $(a) Explain how the proteins control the ‘characteristics’ in an organism with the help of an example of ‘short height’ trait in pea plant. (b) Name the information source of making proteins in a cell.$

Question 1