(c) Benjarnin Franklin
   (d) Einstein
Ans: (c)
164. A man is sitting on a rotating stool with his arms outstretched. If suddenly
   he folds his arm the angular velocity of the man would: [NDA 2010]
   (a) increase
   (b) decrease
   (c) become zero
   (d) remain constant
Ans: (a)
165. Which of the following is a paramagnetic? [UPPCS (Pre) 1990]
   (a) nickel
   (b) cobalt
   (c) chromium
   (d) copper
Ans: (c)
166. Which one of the following is diamagnetic: [IAS (Pre) 1998]
   (a) iron
   (b) bismith
   (c) nickel
   (d) cobalt
Ans: (b)
167. The magnetic effect of electric current was firstly observed by: [RRB
   ASM/GG 2005]
   (a) Henry
   (b) Oersted
   (c) Faraday
   (d) Volt
Ans: (b)
168. Who discovered the electric bulb? [MPPCS (Pre) 2011]
   (a) Thomas Edison
   (b) Alexander Graham Bell