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CTET Solved Paper MCQ - UTET April 2015 Paper2

131 Emission of which one of the following will produce isobars?

Atoms of different elements having same mass numbers but different atomic numbers are called isobars. Isobar is formed due to beta emission of a radioactive element.

132 The radioactive isotope of hydrogen is called

Hydrogen has three main isotopes, there are protium (¹H) deuterium (²H) and tritium (³H). Protium and deuterium are stable while tritium is radioactive and has a half-life of about 12 years

133 Vapour pressure of liquid depends upon the

Vapour pressure of a liquid depend only on temperature and nothing else.

134 Which one of the following phenomena cannot be attributed to the refraction of light?

Red shift is a phenomenon not attributed to the refraction of light.

135 During day time, plants absorb

Plants absorb CO₂ during daytime to form sugar by the process of photosynthesis.

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Question:

Heat energy of an object is

A. the average energy of the molecules of the object
B. The total energy of the molecules of the object
C. the average velocity of the molecules of the object
D. the average potential energy of the molecules of the object

Correct answer: B

Explanation:

Heat energy or thermal energy of an object is the total thermal kinetic energy and thermal potential energy of all its atoms and molecules. So, we can say…

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