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- Question
When a steel ball is placed on the surface of mercury, it does not sink because
Options- A. of the surface tension of mercury
- B. mercury is a semisolid
- C. of the high viscosity of mercury
- D. the density of mercury is greater than that of steel
- Correct Answer
- the density of mercury is greater than that of steel
ExplanationA solid sinks in a liquid if its density is greater than that of the liquid. if less, it floats
- 1. A body given with an initial velocity moved under the effect of gravity is called? Discuss
- 2. Fat can be seperated from milk in a cream seperator because of :
Options- A. Cohesive Force
- B. Gravitational Force
- C. Centripetal Force
- D. Centrifugal Force Discuss
- 3. A nuclear reactor is said to have become 'critical' when
Options- A. it stops due to malfunctioning
- B. it starts emitting dangerous radioactive radiations
- C. it is shut down to avoid explosion
- D. it is ready to produce controlled energy Discuss
- 4. SI unit of temperature is
Options- A. Kelvin
- B. Celsius
- C. Fahrenheit
- D. Joule Discuss
- 5. Earlist thermometerr was developed by
Options- A. Celsius
- B. Fahrenheit
- C. Kelvin
- D. Galileo Discuss
- 6. If a band is played on the moon the sound will
Options- A. reverberate
- B. be heard by us faintly
- C. be heard upto 10 km from it
- D. not be heard at any distance at all from it Discuss
- 7. Heat is associated with
Options- A. K.E of random motion of molecules
- B. K.E of orderly motion of molecules
- C. Total K.E of random and orderly motion of molecules
- D. None of these Discuss
- 8. Two bulbs are fitted in a room in the domestic electric installation. One of them glows brighter than the other. Then
Options- A. the brighter bulb has smaller resistance
- B. the brighter bulb has larger resistance
- C. both the bulbs have the same resistance
- D. none of these Discuss
- 9. A standing wave occurs when
Options- A. a wave reflects upon itself
- B. the amplitude of a wave exceeds its wavelength
- C. two waves overlap
- D. the speed of the wave is zero or near zero Discuss
- 10. The amount of water vapor in the air is
Options- A. Hot air
- B. Humidity
- C. Dew
- D. Foam Discuss
Physics problems
Search Results
Correct Answer: Projectile
Correct Answer: Centrifugal Force
Correct Answer: it is ready to produce controlled energy
Explanation:
To produce controlled energy i.e energy at a controlled or steady rate, the number of fissions per second must be controlled and maintained at that rate. Excess neutrons should be absorbed by control roads like cadmium.
Correct Answer: Kelvin
Correct Answer: Galileo
Correct Answer: not be heard at any distance at all from it
Explanation:
As there is no atmosphere surrounding the moon, the second from any band that is played there cannot travel outwards there is no material medium surrounding if for its propagation.
Correct Answer: K.E of random motion of molecules
Correct Answer: the brighter bulb has smaller resistance
Correct Answer: a wave reflects upon itself
Explanation:
A standing wave also known as a stationary wave, is a wave in which its peaks or any other point on the wave do not move spatially.
This phenomenon can occur because the medium is moving in the opposite direction to the wave, or it can arise in a stationary medium as a result of interference between two waves traveling in opposite directions. The most common cause of standing waves is the phenomenon of resonance, in which standing waves occur inside a resonator due to interference between waves reflected back and forth at the resonator's resonant frequency.
Hence, standing wave occurs when a wave reflects upon itself.
Correct Answer: Humidity
Explanation:
The amount of water vapor ranges from a trace amount up to 4% of the mass of air. Water vapor exists as an invisible gas in the air.
The amount of water vapor in the air is called absolute humidity. The amount of water vapor in the air as compared with the amount of water that the air could hold is called relative humidity.
The maximum amount of water vapor that can be in the air depends on the air temperature.
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