311. What is the SI unit of frequency?

1. Newton
2. Watt
3. Farad
4. Hertz

Option “4” is correct.
The SI unit of frequency is the hertz (Hz), named after the German physicist Heinrich Hertz; one hertz means that an event repeats once per second.
312. Which one of the following is an insulator?

1. Copper
2. Wood
3. Mercury
4. Aluminium

Option “2” is correct.
Wood is a good insulator.
313. Bubbles of air rise up through liquids due to:

1. Surface tension and adherence
2. Viscosity and buoyancy
3. Air current over the liquid and buoyancy
4. Up thrust and surface tension

Option “2” is correct.
Bubbles of air rise up through liquids due to viscosity and buoyancy.
314. Which one of the following is an insulator?

1. Copper
2. Wood
3. Mercury
4. Aluminum

Option “2” is correct.
Wood is an insulator.
315. Formula for distance is –

1. Speed x time
2. Time / speed
3. Speed x acceleration
4. Velocity / speed

Option “1” is correct.
Distance=Speed × Time
316. What is the fundamental unit of amount of a substance?7

1. Mole
2. Candela
3. Kelvin
4. Meter

Option “1” is correct.
The mole is the unit of measurement for amount of substance in the International System of Units (SI). The unit is defined as the amount or sample of a chemical substance that contains as many constitutive particles.
317. Arithmometer was invented by –

1. Evangelista Torricelli
2. Charles Xavier Thomas
3. Edward Teller
4. Charles Babbage

Option “2” is correct.
The Arithmometer was the first digital mechanical calculator strong enough and reliable enough to be used daily in an office environment. It was invented by Charles Xavier Thomas.
318. ‘The National Science Day’ is observed on-

1. January, 28
2. February, 28
3. March, 28
4. April, 28

Option “2” is correct.
National Science Day is celebrated in India on 28 February each year to mark the discovery of Raman Effect by Indian physicist C.V.Raman on 28 February 1928.
319. Alfred Nobel invented-

1. Microphone
2. Typewriter
3. Dynamite
4. Gramophone

Option “3” is correct.
Swedish scientist Alfred Nobel invented dynamite. The famous Nobel Foundation was established on the basis of his last will in 1900.
320. Which one of the following is used as antifreeze for the automobile engines?

1. Ethanol
2. Ethylene glycol
3. Methanol
4. Propyl alcohol

Option “2” is correct.
Ethylene glycol is an organic molecule most widely used as antifreeze in automobile engines and as an industrial solvent.
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