Which of the following is a physical change?
[A] Oxidation
[B] Reduction
[C] Sublimation
[D] Decomposition

The nucleus of an atom consists of which of the following?
[A] Electrons and Neutrons
[B] Electrons and Protons
[C] Protons and Neutrons
[D] All of the above

What are detergents made of?
[A] Sodium salts of fatty acids
[B] Sodium salts of sulphonic acids
[C] Sodium salts of benzoic acid
[D] None of the above

Which noble gas is used in radiotherapy?
[A] Neon
[B] Argon
[C] Radon
[D] Xenon

Highest percentage of nitrogen is found in which among the following fertilizers among the given options?
[A] Calcium ammonium nitrate
[B] Ammonium nitrate
[C] Calcium nitrate
[D] Urea

Which among the following would cause the bright red color due to bursting of crackers?
[A] Strontium
[B] Sodium
[C] Sulphur
[D] Magnesium

Identify the thermosetting plastic from the given options:
[A] Polythene
[B] Bakelite
[C] Polyvincychloride
[D] Casseine

Which among the following happens in an oxidation reaction ?
[A] Electrons are gained
[B] Electrons are lost
[C] Protons are gained
[D] Protons are lost

Which among the following is the unit of the scale used for measurement of the spicy heat of a chili pepper?
[A] Smith
[B] Wright
[C] Orville
[D] Scoville

1, 2, 5, 7, 11,______,17
a. 12        b. 13
c. 14        d. 15