Day 135: CBSE Class 10 Science
5 questions. Try each one first, then open its answer.
Question 1
Light — Reflection and Refraction. Asked once: 2025 (same type asked 3 times)
12An object is placed at a distance of 30 cm from the pole of a concave mirror. If its real and inverted image is formed at 60 cm in front of the mirror, the focal length of the mirror is :Tap an option to check your answer.
Question 2
Our Environment. Asked once: 2024 (same type asked 3 times)
16Which one of the following is not a natural ecosystem ?Tap an option to check your answer.
Question 3
Our Environment. Asked once: 2024 (same type asked 3 times)
Two statements are given, one labelled Assertion (A) and the other labelled Reason (R). Select the correct answer from the options given below.20Assertion (A) : Green plants trap only 1% of the energy of sunlight that falls on their leaves. Reason (R) : All green plants are the producers in a food chain.Tap an option to check your answer.
Question 4
Carbon and its Compounds. Asked once: 2022 (same type asked 3 times)
7Consider the carbon compounds having following molecular formula : (i) (ii) (iii) (iv) (v) (a) State the number of double covalent bonds present in . (b) Write the formula of first member of the homologous series to which the carbon compound belongs. (c) Which one of the above compounds forms ring structure of carbon atoms ? (d) Identify, which of the above compounds, is a member of alkane series.Question 5
How do Organisms Reproduce?. Asked once: 2024 (same type asked 3 times)
10Select from the following the conditions responsible for the rapid spread of bread mould on a slice of bread : (i) Formation of large number of spores (ii) Presence of moisture and nutrients in bread (iii) Low temperature (iv) Presence of hyphaeTap an option to check your answer.