Physics - Study Mode

[#671] Which of the following properties is found only in ferromagnetic materials ?
Correct Answer

(C) Hysteresis

Explanation

Solution: Hysteresis is found only in ferromagnetic materials.

[#672] Magnetic field lines about a current-carrying wire
Correct Answer

(A) Circle the wire in closed loops

Explanation

Solution: Magnetic field lines about a current-carrying wire circle the wire in closed loops.

[#673] If the velocity-time graph of a particle is represented by y = mt + c, then the particle is moving with
Correct Answer

(C) Constant acceleration

Explanation

Solution: In this case the given equation shows that that the velocity is linear with time and therefore the particle is moving with constant acceleration because for a particle to acquire constant acceleration the graph of the velocity time graph should be in linear with the time function.

[#674] Which one of the following is applicable to collision-coalescence process of precipitation?
Correct Answer

(A) Clouds which do not extend beyond the freezing level

Explanation

Solution: In colder clouds: droplets formed by Bergeron mechanism. But, in many parts of the world the air is too warm for ice crystals to form. This being the case, rain and snow cannot develop following the Bergeron Process. Instead, tiny droplets form as they collide into one another creating larger and larger droplet, this is known as collision-coalescence process. So, warmer clouds are associated with this keyword.

[#675] The law of conservation of energy states that
Correct Answer

(A) Energy can neither be created nor destroyed

Explanation

Solution: The law of conservation of energy states that energy can neither be created nor destroyed.