Question

21. Two circular coils A and B are placed closed to each other. If the current in the coil A is changed, will
some current be induced in the coil B? Give reason.
(3)
22. Define the term pollination. Differentiate between self pollination and cross pollination. (3)
23. You must have seen tarnished copper vessels being cleaned with lemon or tamarind juice. Explain why
these sour substances are effective in cleaning the vessels.
(3)
24. Describe fertilization and implantation in human being.
(3)
26. Show how you would connect three resistors, each of resistance 6 n, so that the combination has a
resistance of (i) 9 n, (ii) 40.
(3)
27. What are the differences between aerobic and anaerobic respiration? Name some organisms that use
the anaerobic mode of respiration.
(3)
(3)
28. What is a neutralization reaction? Give two examples.
(3)
29. Balance the following chemical equations.​

Answer 1

Answer:

Explanation:

Two circular coils A and B are placed close to each other. When the current in coil A is changed, the magnetic field associated with it also changes. ... This change in magnetic field lines around coil B induces an electric current in it. This is called electromagnetic induction.