MCQs

Q271: Which one of the following will be good conductor of electricity?

• A) Dilute solution of glucose
• B) Molten NaCl
• C) Pure distilled water

Q272: Atmospheric pressure at sea level is _______?

• A) 760 mm
• B) 746 mm
• C) 820 mm

Q273: When the time on the watch is 1:30, the angle between hour and minute hand is?

• A) 45°
• B) 120°
• C) 150°

Q274: Tea cools faster in a?

• A) Thermos flask
• B) Ceramic cup
• C) Steel cup

Q275: A man feels hot when he comes close to fire. Heat is transferred through?

• A) Conduction
• B) Convection
• C) Radiation

Q276: Heat needed to change state

• A) Heat needed to boil a liquid
• B) Heat needed to raise temperature of 1 kg of substance by 1°C
• C) Heat absorbed during freezing

Q277: Ammonia is prepared by the process called?

• A) Haber’s Process
• B) Ostwald Process
• C) Contact Process

Q278: Hydrogen exist as? Atom, Molecules, Energy, All of these

• A) Atom
• B) Molecules
• C) Energy

Q279: What is the mathematical statement of the first law of thermodynamics?

• A) ΔE = q + W
• B) ΔE = -q -W
• C) ΔE = -q - W

Q280: Water is flowing in steam line motion through a horizontal tube. The pressure at a point in the tube is P where the velocity of flow is v. at another point, where the pressure is P/2, the velocity of flow is [density of water=p]?

• A) (V2 - p/p)
• B) (V2 + p/p)
• C) (V2 - 2p/p)