The first nuclear test conducted by India under the code name of "Smiling Buddha" was in the year:

• 1973
• 1974
• 1975
• 1976

A device that is responsible for changing the voltage is:

• Transformer
• Encoder
• Decoder
• Translator

In which year was the "@" chosen for its use in e-mail addresses?

• 1972
• 1976
• 1980
• 1984

Plants absorb dissolved nitrates from soil and convert them into:

• free nitrogen
• urea
• ammonia
• proteins

India's first atomic power station was set up at:

• Surat (Gujarat)
• Tarapur (Maharashtra)
• Trombay (Maharashtra)
• Trombay (Maharashtra)

Which of the following is a non metal that remains liquid at room temperature?

• Phosphorous
• Bromine
• Chlorine
• Helium

One kilometre is equal to how many miles?

• 0.84
• 0.5
• 1.6
• 0.62

Which type of fire extinguisher is used for petroleum fire?

• Powder type
• Liquid type
• Soda acid type
• Foam type

The hottest part of the gas flame is known as:

• luminous zone
• dark zone
• blue zone
• non-luminous zone

The salinity of the sea water is:

• 1.5 %
• 2.5 %
• 3.5 %
• 4.5 %