Q. Why the needle of iron swims on water surface when it is kept gently? 
A) It will remain under the water, when it will displaced more water than its weight
B) the density of needle is less than that of water
C) due to surface tension 
D) due to its shape

Related Questions

Q. The gas used in discharge tubes for optical decoration and advertising is
A) Carbon dioxide
B) Ammonia
C) Sulphur dioxide
D) Neon
Q. Which one of the following is the best conductor of electricity? 
A) Mica 
B) Copper
C) Gold
D) Silver
Q. Why the needle of iron swims on water surface when it is kept gently? 
A) It will remain under the water, when it will displaced more water than its weight
B) the density of needle is less than that of water
C) due to surface tension 
D) due to its shape
Today's Challenging Question
Q. Ajay & Bimal can do a price of work in 10 days, Bimal & Chetan can do in 15 days and Chetan and Ajay in 20 days. They work together for 6 days and then Ajay leaves and now Bimal & Chetan work together for 4 more days. If Bimal leaves, how long will Chetan take to finish the work?
A) 12 days
B) 10 days
C) 16 days
D) none
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