GK - Physics
26.
A balloon filled with hydrogen will
Answer
When the balloon is filled with hydrogen gas, the density of the balloon becomes less than the density of the atmospheric air. The weight of the balloon becomes less than the upthrust or buoyant force acting on it. Hence, the balloon floats in the air.
Answer :
Option BExplanation :
When the balloon is filled with hydrogen gas, the density of the balloon becomes less than the density of the atmospheric air. The weight of the balloon becomes less than the upthrust or buoyant force acting on it. Hence, the balloon floats in the air.
27.
The energy associated with motion is called
Answer
Energy can be either potential or kinetic. The energy associated with motion is called Kinetic energy and similarly, the energy associated with position is called Potential energy.
Answer :
Option BExplanation :
Energy can be either potential or kinetic. The energy associated with motion is called Kinetic energy and similarly, the energy associated with position is called Potential energy.
28.
Rain drops acquire spherical shape due to
Answer
Raindrops start to form in a roughly spherical structure due to the surface tension of water. This surface tension is the "skin" of a body of water that makes the molecules stick together. The cause is the weak hydrogen bonds that occur between water molecules.
Answer :
Option BExplanation :
Raindrops start to form in a roughly spherical structure due to the surface tension of water. This surface tension is the "skin" of a body of water that makes the molecules stick together. The cause is the weak hydrogen bonds that occur between water molecules.
29.
Light year is a unit of
Answer
The light-year is a unit of length used to express astronomical distances.
Answer :
Option BExplanation :
The light-year is a unit of length used to express astronomical distances.
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