1. Radio was invented by (4)
(a) Thomas Alva Edison
(b) Graham Bell
(c) J.L. Baird
(d) G. Marconi
2. A in AIDS stands for (2)
(a) Accumulate
(b) Acquired
(c) Acute
(d) None of these
3. Brass is an alloy of (3)
(a) Copper and Tin
(b) Copper and Nickel
(c) Copper and Zinc
(d) Zinc and Tin
4. Purest form of Carbon is (4)
(a) Coal
(b) Graphite
(c) Charcoal
(d) Diamond
5. It changes blue litmus to red (1)
(a) Acid
(b) Ash
(c) Alkali
(d) Salt
