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- Question
Light travels slowest in
Options- A. Glass
- B. Water
- C. Air
- D. Vacuum
- Correct Answer
- Glass
ExplanationBecause the refractive index of glass is highest, light travels slowly in Glass.
We know that the speed of light depends on the refraction index. The higher the index of refraction is, the slower the speed of light is.
R.I of air and vacuum = 0 (air is a teeny bit more but can be taken as 0)
R.I of water = 1.33
R.I of glass = 1.4.Hence, Light travels slowest in Glass.
- 1. Modem is used mostly for ?
Options- A. A modern empty memory modules
- B. Connecting to internet
- C. Mostly for file system
- D. All the above Discuss
- 2. Microwave communication uses high-frequency.
Options- A. TRUE
- B. FALSE Discuss
- 3. The heat from the sun reaches earth through Convection.
Options- A. TRUE
- B. FALSE Discuss
- 4. What type of lens is a magnifying glass?
Options- A. Diverging
- B. Spherical
- C. Converging
- D. Achromatic Discuss
- 5. Which is an example of Phototropism?
Options- A. roots of a plant following water
- B. plant bending toward the light
- C. roots growing into the soil
- D. a venus flytrap capturing a fly Discuss
- 6. Metals are good conductors of electricity because
Options- A. The atoms are lightly packed
- B. They contain free electrons
- C. They have high melting point
- D. All the above Discuss
- 7. The Length of the Day is determined in
Options- A. length of the hours
- B. length of the year
- C. astronomical units
- D. solar terms Discuss
- 8. Which of the following is a Non Renewable Resource of Energy?
Options- A. Wind Power
- B. Hydrogen Fuel
- C. Natural Gas
- D. Solar Energy Discuss
- 9. What frequency range is the high frequency band?
Options- A. 3 kHz
- B. 3 to 30 MHz
- C. 30 to 300 MHz
- D. 10 GHz Discuss
- 10. Air pressure is measured in which of the following units?
Options- A. Steridian
- B. kg/mts
- C. Newton
- D. Pascal Discuss
Physics problems
Search Results
Correct Answer: Connecting to internet
Explanation:
A modem is nothing but short for Modulator and Demodulator. It is used mostly for connecting to the internet.
A modem is a device or program that enables a computer to transmit data over, for example, telephone or cable lines. Computer information is stored digitally, whereas information transmitted over telephone lines is transmitted in the form of analog waves.
Correct Answer: TRUE
Explanation:
Microwaves are high-frequency signals in the 300 MHz to 300 GHz range. This is in contrast to radio signals, which are typically broadcast in all directions. Radio signals operate in the 3 Hz to 300 MHz range.
Microwave signals are used for both satellite and ground-based communications.
Correct Answer: FALSE
Explanation:
The given statement, The heat from the sun reaches earth through Convection is FALSE.
Heat from the sun actually reaches the earth through Radiation. The process occurs through electromagnetic radiation, specifically, in which molecules are warmed when the heat reaches them, and these molecules then warm other molecules touching them, which continues until we feel the sun's heat.
Correct Answer: Converging
Explanation:
A magnifying glass is a convex lens that is used to produce a magnified image of an object. It is also called a hand lens in laboratory contexts.
Correct Answer: plant bending toward the light
Explanation:
Phototropism is the ability of a photosynthesizing organism, to grow directionally in response to a light source. It is very common in plants, but can also occur in other organisms such as fungi.
Example :: Sunflower
Correct Answer: They contain free electrons
Explanation:
Metal particles are held together by strong metallic bonds, which is why they have high melting and boiling points. The free electrons in metals can move through the metal, allowing metals to conduct electricity.
Because the electrons in the atom's higher energy levels can separate from the atoms easily, they can be pulled out with very little energy. Because the molecular structure of the metal is such that 'free electrons' are free to move, thus being categorized as electrically conductive.
For example, copper is used for electrical wiring because it is a good conductor of electricity.
Correct Answer: astronomical units
Explanation:
The Length of the Day is determined in Astronomical Units.
The length of a day corresponds to the time the Earth takes to turn around on its axis, which is approximately 24 hours. But it's not exactly 24 hours.
This phenomenon is due to tides raised by the Moon which slow Earth's rotation. Because of the way the second is defined, the mean length of a day is now about 86 400.002 seconds, and is increasing by about 1.7 milliseconds per century.
Correct Answer: Natural Gas
Explanation:
Natural Gas is a Non Renewable Resource of Energy because that does not renew itself once used, unlike the other choices.
It is a resource that will not be naturally replenished.
Correct Answer: 3 to 30 MHz
Explanation:
The HF band is based on frequencies 3 to 30 Mhz. AM radio stations are in the HF band but normally are stated in kilohertz.
Correct Answer: Pascal
Explanation:
Pressure = (Net Force) / (Applied area) = Newton / square meters
Measuring units of pressure are:
. Pascal
. Bar
. Torr
. Pounds per square inch (psi)
. Standard atmosphere (atm).
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