| Updated On February 13th, 2020 at 12:38 pm
Q1. Who invented Television?
(a) J L Baird
(c) James Clerk Maxwell
(d) Nikola Tesla
Q2. Electroscope was invented by –
(a) William Gilbert
(b) Alfred Nobel
(c) Joseph Nicephore Niepce
(d) Ted Nelson
Q3. The light with the shortest wavelength is
Q4. Glass is also called ________.
(a) Super cooled liquid
(b) Super liquid
(c) Ideal liquid
(d) Distilled liquid
Q5. If a body slides over a surface, the force resisting the motion between them is called ______.
(a) Centripetal force
(c) Centrifugal force
Q6. In a streamline flow, ________ at every point in the fluid remains same.
Q7. Postage Meter was invented by –
(a) Fyodor Pirotsky
(b) Arthur Pitney
(c) Fritz Pfleumer
(d) Stephen Perry
Q8. Who invented Helicopter?
Q9. If ice floating on water in a vessel melts, the water level in the vessel _______.
(b) Does not change
(c) First increases before decreasing
Q10. Physical quantities, which have _______ only and no _______ are called scalar quantities.
(a) Direction, magnitude
(b) Magnitude, direction
(c) Speed, velocity
(d) Velocity, speed
Sol.John Logie Baird was a Scottish engineer, innovator, one of the inventors of the mechanical television, demonstrating the first working television system on 26 January 1926.
Sol.An electroscope is an early scientific instrument that is used to detect the presence and magnitude of electric charge on a body. It was the first electrical measuring instrument. The first electroscope, a pivoted needle called the versorium, was invented by British physician William Gilbert around 1600.
Sol. Wavelength of red colour is largest and violet colour has the shortest wavelength.
Sol. Glass is sometimes called a super cooled liquid because it does not form a crystalline structure, but instead forms an amorphous solid that allows molecules in the material to continue to move.
Sol. Friction is the force resisting the relative motion of solid surfaces, fluid layers, and material elements sliding against each other.
Sol. In a streamline flow, velocity at every point in the fluid remains same.
Sol. Postage Meter was invented by Arthur Pitney.
Sol. Igor Sikorsky, a Russian is recognized as father of modern helicopters.
Sol.The water level remains the same when the ice cube melts. A floating object displaces an amount of water equal to its own weight. Since water expands when it freezes, one ounce of frozen water has a larger volume than one ounce of liquidwater.
Sol.A scalar quantity is a one dimensional measurement of a quantity, like temperature, or weight, it has only magnitude and no direction.
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