Q1. Supercooling is cooling of liquid _____.
(a) Below freezing point
(b) Below melting point
(c) At melting point
(d) Above melting point
Q2. For which of the following game, players must have the knowledge of Pascal’s law?
(b) Scuba diving
Q3. Which one among the following components is used as an amplifying device?
Q4. In an optical fibre the signal is transmitted –
(a) due to total internal reflection
(b) In a curved path
(c) in a straight line path
(d) Due to refraction
Q5. When we see an object, the image formed on the retina is ________
(a) Virtual and inverted
(b) Real and erect
(c) Virtual and erect
(d) Real and inverted
Q6. Kinetic energy depends on
(a) Both mass and velocity of the moving body
(b) the mass of the moving body
(c) the pressure of the moving body
(d) The velocity or speed of the moving body.
Q7. Even after sunset, the air near the Earth’s surface continue to receive heat due to:
(d) Terrestrial Radiation
Q8. The component used for tuning a radio is basically a variable ___________.
Q9. Sextant is an instrument used in which of the following?
(a) Cloud cover
(b) Medical treatment
Q10. Which of the following waves cannot be polarised?
(d) Ultra violet
Sol. Supercooling is the process of chilling a liquid below its freezing point, without it becoming solid.
Sol. Pascal’s principle states that “a change in the pressure of an enclosed incompressible fluid is conveyed undiminished to every part of the fluid and to the surfaces of its container.” For every 10m depth the pressure on the diver increases by 1 atm so at a depth of 10 meters under water, pressure is twice the atmospheric pressure at sea level. Thus, during Scuba diving players must have the knowledge of Pascal’s law.
Sol. A transistor is a semiconductor device used as an amplifying device.
Sol.In an optical fibre the signal is transmitted due to total internal reflection.
Sol. When we see an object, the image formed on the retina is real and inverted.
Sol. The amount of translational kinetic energy that an object has depends upon two variables: the mass (m) of the object and the speed (v) of the object.
Sol.Even after sunset, the air near the Earth’s surface continue to receive heat due to Terrestrial Radiation.
Sol. The component used for tuning a radio is basically a variable capacitor.
Sol.The sextant is an instrument used to measure angles. Mainly used at sea, the tool is so named because its arc is one sixth of a circle – 60 degrees.
Sol.Ultrasonic waves cannot be polarised,ultrasonic wave is an example of sound wave and it cannot be polarised.
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