Q. A family consumes 14.5 kg of LPG in 29 days. The calorific value of LPG is 55 kJ/gm. The average energy consumed per day is -
1) 275 kJ
2) 27.5 kJ
3) 27500 kJ
4) 0.275 kJ
Q. Ozone is a gas having _______________ atoms of Oxygen in its molecules.
1) Four
2) One
3) Two
4) Three
Q. An electric heater of 1 kW rating is used to heat water everyday for 2 hours. In 10 days, it will consume -
1) 20 kWh
2) 2 kWh
3) 0.2 kWh
4) 200 kWh
Q. If a barometer carries water instead of mercury, then the height of the column for a pressure equivalent to 75 cm of mercury would be -
1) 1050 cm
2) 1020 cm
3) 1000 cm
4) 5.5 cm
Q. Which of the following statements is wrong?
1) Ionic bonds are non-rigid and non-directional
2) Compounds formed by ionic bonds are non-conductors of electricity
3) Ionic bonds are formed by the transfer of electrons from a metal to a non- metal atom
4) Compounds formed by ionic bonds are hard and brittle
Q. What do you understand by the term 'BINDING ENERGY'?
1) The energy released when a nucleus is formed from protons and neutrons
2) The force of attraction between an electron in the first orbit and the nucleus
3) Electrons belonging to the same major energy level
4) Energy associated with a photon
Q. Which of the following is being used for applications such as assessing the depth of oceans, measuring thickness, determining the position of Icebergs, detecting flaws in metals, etc.?
1) Ultrasonic waves
2) X-rays
3) Light waves
4) Y-rays
Q. The sound waves in the audible range have Frequencies in the range of -
1) 20 Hz to 20,000 Hz
2) 0.5 Hz to 5 Hz
3) 1 Hz to 10 Hz
4) 20,000 hz to 40,000 Hz
Q. What do you understand by the term 'Absolute Pressure'?
1) It is the atmospheric pressure at the mean sea level
2) It is the atmospheric pressure expressed in kg/cm2
3) It is the pressure equal to the algebraic sum of atmospheric and gauge pressures
4) It is the pressure as seen on the gauge of a pressure-measuring instrument
Q. The efficiency of a heat engine is 40% If 10,000 joules of heat energy are supplied to it, then the useful work done by the engine would be -
1) 40,000 Joules
2) 10,000 Joules
3) 25,000 Joules
4) 4,000 Joules
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