Physics Questions and Answers

Q: What happens to the boiling point of a substance when the pressure is increased?

The boiling point increases with pressure.A liquid boils when its saturated vapour pressure equals the surrounding pressure, so a higher external pressure requires a higher temperature to reach it. A pressure cooker exploits this, raising the boiling point to about 120 °C; on a mountain, the lower pressure makes water boil below 100.

Q: Electronegativity is a measure of

Electronegativity is a measure of non-metallic character.It is the tendency of an atom to attract a shared pair of electrons towards itself, and it rises across a period and falls down a group - exactly the trend of non-metallic character. Metals are electropositive, giving electrons up rather than attracting them.

Q: Which law is also called the law of inertia ?

Newton's first law is the law of inertia.It states that a body remains at rest or in uniform motion in a straight line unless an external force acts on it, so it defines inertia and identifies the inertial frames in which the other two laws hold.

Q: What is the scale used for measuring the intensity of the earthquake?

Earthquake magnitude is measured on the Richter scale.Devised by Charles Richter in 1935, it is logarithmic: each whole number is a tenfold rise in wave amplitude and about a thirty-twofold rise in energy released. The Mercalli scale, by contrast, records the intensity of the shaking felt at a place rather than the energy at the source.

471.

What happens to the boiling point of a substance when the pressure is increased?

A.Increases
B.Decreases
C.Remains Same
D.Becomes zero

Answer: A

The boiling point increases with pressure.

A liquid boils when its saturated vapour pressure equals the surrounding pressure, so a higher external pressure requires a higher temperature to reach it. A pressure cooker exploits this, raising the boiling point to about 120 °C; on a mountain, the lower pressure makes water boil below 100.

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472.

Electronegativity is a measure of

A.Metallic character
B.Non-metallic character
C.Basic Character
D.None of these

Answer: B

Electronegativity is a measure of non-metallic character.

It is the tendency of an atom to attract a shared pair of electrons towards itself, and it rises across a period and falls down a group - exactly the trend of non-metallic character. Metals are electropositive, giving electrons up rather than attracting them.

Discuss in Forum

473.

Which law is also called the law of inertia ?

A.Newton's first law
B.Newton's Second Law
C.Newton's Third Law
D.All of these

Answer: A

Newton's first law is the law of inertia.

It states that a body remains at rest or in uniform motion in a straight line unless an external force acts on it, so it defines inertia and identifies the inertial frames in which the other two laws hold.

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474.

What is the scale used for measuring the intensity of the earthquake?

A.Metric Scale
B.Quake Scale
C.Richter Scale
D.Epicentre Scale

Answer: C

Earthquake magnitude is measured on the Richter scale.

Devised by Charles Richter in 1935, it is logarithmic: each whole number is a tenfold rise in wave amplitude and about a thirty-twofold rise in energy released. The Mercalli scale, by contrast, records the intensity of the shaking felt at a place rather than the energy at the source.

Discuss in Forum

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