If a wire of resistance R is melted and recast to half of its length, then the new resistance of the wire will be
1). 0
2). 0
3). R
4). 2R
4. How many three digit numbers can be formed from the digits 5, 7, 4, 3, 8 without repetition ?
6. Which of the following preventive measures is adopted to avoid mental retardation?
7. The pigment that protect plants from harmful effect of ultraviolet rays ts
9. मैसूर
10. Ameliorate means