Day 46: CBSE Class 10 Science

5 questions (11 parts). Try each one first, then open its answer.

Question 1
Electricity. This type asked 4 times: 2022, 2023, 2024, 2025. This one: 2025
22 (b) $4\,\Omega$
Question 2 (case study, 4 parts)
Electricity. This type asked 4 times: 2022, 2023, 2024, 2025. This one: 2025
Study the circuit shown in which two resistors X and Y of resistances $3\,\Omega$ and $6\,\Omega$ respectively are joined in series with a battery of 2 V.
39 (I) $Draw a circuit diagram showing the above two resistors X and Y joined in parallel with same battery and same ammeter and voltmeter.$
39 (II) $In which combination of resistors will the (i) potential difference across X and Y and (ii) current through X and Y, be the same ?$
39 (III) (a) $Find the current drawn from the battery by the series combination of the two resistors (X and Y).$
39 (III) (b) $Determine the equivalent resistance of the parallel combination of the two resistors (X and Y).$
Question 3
Heredity. This type asked 4 times: 2022, 2023, 2024, 2025. This one: 2025
8 $\mathrm{F_2}$
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Question 4 (case study, 4 parts)
How do Organisms Reproduce?. This type asked 4 times: 2022, 2023, 2024, 2025. This one: 2025
When a girl is born, the ovaries already contain thousands of immature eggs. On reaching puberty, some of these start maturing. One matured egg is released every month by one of the ovaries. The two oviducts unite into an elastic bag-like structure known as uterus.
38 (a) $Write the site of fertilization in human female.$
38 (b) $How does the uterus prepare itself to receive and nurture the growing embryo ? Explain.$
38 (c) (i) $What happens when the egg is not fertilized ?$
38 (c) (ii) $How does the developing embryo get nutrition from the mother’s blood ? Explain.$
Question 5
Metals and Non-metals. This type asked 4 times: 2022, 2023, 2024, 2025. This one: 2025
3 $An element ‘M’ has 25% of the electrons filled in the third shell as in the second shell. The element ‘M’ is :$
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Question 1

Question 2 (case study, 4 parts)

Question 3

Question 4 (case study, 4 parts)

Question 5