when a person enters a dark ^ room from bright light, he cannot see anything clearly for some time. Slowly he starts seeing things. This is because the
1). Length of lens increases
2). Iris expands
3). Iris contracts
4). Distance between the lens and retina increases
1. "Intelligence is rational thinking”. This definition of intelligence is’ given by -
2. A device which converts mechanical energy into electrical energy is called
7. How many three digit numbers can be formed from the digits 5, 7, 4, 3, 8 without repetition ?
9. Which of the following preventive measures is adopted to avoid mental retardation?
10. The pigment that protect plants from harmful effect of ultraviolet rays ts