MCQs

Q181: In modern periodic table, how many periods are there?

• A) 7
• B) 8
• C) 9

Q182: A reaction in which heat energy is absorbed or taken into the system is called __________?

• A) Exothermic reaction
• B) Endothermic reaction
• C) Elimination reaction

Q183: When blue litmus paper dipped acids, its colour change to ____?

• A) Pink
• B) Blue
• C) Red

Q184: In which of the following Vitamin D is found?

• A) Milk
• B) Cold liver oil
• C) All of these

Q185: Nuclei having the same nuclear charge but different masses are called ____?

• A) Isobars
• B) Isotopes
• C) Isoelectronic

Q186: The shielding effect across the period _______?

• A) Increases
• B) Decrease
• C) Moderate

Q187: In Fahrenheit scale the boiling point of water is ______?

• A) 208°F
• B) 210°F
• C) 212°F

Q188: A part of maize seed that contains stored food is called?

• A) Embryo
• B) Endosperm
• C) Seed coat

Q189: Bio elements considered as vital for life are ______ members or in numbers.

• A) 13
• B) 12
• C) 16

Q190: The audible range of normal human ear is ____?

• A) 16 Hz to 20kHz
• B) 10 Hz to 31kHz
• C) 20 Hz to 20kHz