Explanation

The component of an electric circuit that opposes the flow of charges in the circuit is called a resistor.

Explanation

• Fission is the splitting of a nucleus that releases free neutrons and lighter nuclei.
• The fission of heavy elements is highly exothermic which releases about 200 million eV compared to burning coal which only gives a few eV.

Explanation

The telescope is undoubtedly the most important investigative tool in astronomy.

A celestial body that revolves around a planet is known as a natural satellite.

Explanation

Sirius is the brightest star in the night sky.

Sirius means صبح کا ستارہ 

Explanation

Uranus is four times the size of the Earth.

Uranus appears greenish in color because of the large amount of methane gas present in its atmosphere.

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Explanation

There are 5 planets visible without a telescope, Mercury, Venus, Mars, Jupiter and Saturn.

Explanation

• the planet that moves around the Sun at the largest speed is Mercury
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• Mercury is the fastest planet, which speeds around the sun at 47.87 km/s.
• In miles per hour, this equates to a whopping 107,082 miles per hour.

Explanation

Number of moons in the planets

Saturn: 83

Jupiter: 92

Uranus: 27

Neptune: 14

Mars: 2

Earth: 1

Venus: 0

Mercury: 0

Explanation

Petroleum, natural gas & coal are called non-renewable energy sources.

The most popular renewable energy sources currently are:

1.      Solar energy

2.      Wind energy

3.      Hydro energy

4.      Tidal energy

5.      Geothermal energy

6.      Biomass energy

Explanation

A hydrogen-filled balloon expands as it rises and may even burst after rising very high in the atmosphere

As one goes high, the weight of the atmosphere above decreases and so does the pressure.

Thus for a balloon filled on the ground, the pressure inside the balloon exceeds that outside and thus it bursts.