Which country became the 31st member of NATO in

For a system of particles, the center of mass moves:

Which part of cinnamon tree is used in condiments and medicines ?

Which of the following is the product when CH₃CHO is reduced?

A fluid is flowing steadily through a horizontal pipe of varying cross-section. According to Bernoulli’s principle, the pressure is:

Which of the following isotope of uranium is used as a nuclear-fuel in reactors?

Match List-I with List-II and select the correct answer using the code given below the Lists:

Which of the following instrument is used to measure heat radiation?

A liquid initially contracts when cooled down to 4°C but on further cooling down to 0°C, it expands. The liquid is 

Motion that repeats itself after some period of time, is called ______ motion.