341. When a piece of ice floating in a glass of water melts, the level of water will:

1. Fall
2. Rise
3. Remain same
4. Fall or rise depends on the temperature of water

Option “3” is correct.
We know that the mass of liquid displaced by the floating ice equals to the mass of the object. That’s why the ice caps float on water. Similarly, when an ice cube melts in a glass of water, the water level does not change as the melted water will occupy exactly the same amount of space as the ice under the water level previously occupied.
342. If a gas is compressed to half of its original volume at 27°C, to what temperature should it be heated to make it occupy is original, volume?

1. 327°C
2. 600°C
3. 54°C
4. 300°C

Option “1” is correct.
343. Which of the following material is used in the solar panel?

1. Silicon
2. Copper
3. Nichrome
4. Platinum

Option “1” is correct.
Silicon is a semiconductor material. When it is doped with impurities like gallium and arsenic its ability to capture the sun’s energy and convert it into electricity. Hence it is used in Solar cells.
344. Red is used an as emergency or danger signal because –

1. it is a striking colour
2. its wavelength is the longest
3. its low wavelength
4. it has very high energy

Option “2” is correct.
Red is used an as emergency or danger signal because it has longest wavelength. It scattered the least by air molecules. The effect of scattering is inversely related to the fourth power of the wavelength of a color. So red light is able to travel the longest distance.
345. Which one of the following SI unit is not correctly matched?

1. Work-Joule
2. Force-Newton
3. Mass-kg
4. Pressure-Dyne

Option “4” is correct.
Pascal is the unit of pressure in the international system of units (SI). Dyne is unit of force in CGS system. Clearly, option (d) is not correctly paired.
346. Identify the mineral not associated with radioactive elements-

1. Monazite
2. Thorium
3. Beryllium
4. Chromium

Option “4” is correct.
All options except chromium are being used as nuclear fuel of radioactive elements.
347. Which of the following is not a fuel element?

1. Uranium
2. Thorium
3. Radium
4. Helium

Option “4” is correct.
All the radioactive elements are used as the nuclear fuel except helium because it is inert in nature. It does not form compounds or react with any other element.
348. The Pokhran II test was conducted on-

1. June 11th, 1998
2. June 9th, 1998
3. May 11th, 1998
4. May 29th, 1998

Option “3” is correct.
Pokhran-II was the series of five nuclear bomb tests conducted by India under operation “Shakti” at the Indian Army’s Pokhran test range on May 11, 1998. It was the second Indian nuclear test after Pokhran-I.
349. What type of energy in wind blowing?

1. Only potential
2. Only kinetic
3. Electrical
4. Potential and kinetic both

Option “2” is correct.
The kinetic energy in the energy in moving objects or mass. The kinetic energy of the wind (wind energy) can be converted into electrical or mechanical energy.
350. When light passes from one medium to another, this phenomenon of change in its direction is called _____.

1. Refraction
2. Diffraction
3. Propagation
4. No option is correct

Option “1” is correct.
Refraction is the bending of light as it passes from one medium to another. The bending is caused by the differences in density between the two substances.
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