The principle of working of the periscope is based on:

(A) Reflection only
(B) Refraction only
(C) Reflection and refraction
(D) Reflection and interference

A thermostat is:

(A) A device which varies the temperature of a bath.
(B) An instrument by which the accuracy of thermometers is determined.
(C) A device used to maintain a constant temperature of a water bath or an oven.
(D) A modem type of thermoflask which works on the principle of equipartition of heat energy.

Which of the following statements is correct?

(A) Dynamo converts electrical energy into heat energy and electric motor converts mechanical energy into electrical energy.
(B) Dynamo converts mechanical energy into electrical energy and electric motor converts electrical energy into mechanical energy.
(C) Both dynamo and electric motor converts electrical energy into mechanical energy.
(D) Both dynamo and electric motor converts mechanical energy into electrical energy.

Which of the following works on Bernoulli's principle?

(A) Gas lighter
(B) Gas stove
(C) Bunsen burner
(D) None of these

Which of the following statements regarding the pressure cooker is not true?

(A) Stearn helps to cook food earlier
(B) Under high pressure, the boiling point of a liquid decreases
(C) It leads to saving in terms of fuel consumption
(D) None of the above

Who amongst the following Generals of Allauddin Khilji, was known as the Rustam of the age and the hero of the time?

(A) Malik Kafur
(B) Ghazi Malik
(C) Zafar Khan
(D) None of these

The King who did not allow anybody to laugh in his court was:

(A) Qutabuddin Aibak
(B) Iltutrnish
(C) Allauddin Khilji
(D) Balban

Who among the following gave maximum resistance to Britishers?

(A) Rajputs
(B) Mughals
(C) Sikhs
(D) Marathas

When did Alexander invade India?

(A) 336 B.C.
(B) 326 B.C.
(C) 320 B.C.
(D) 308 B.C