Explanation

If the angle between the vector area and the electric field is 30∘, then the flux will be maximum when √3/2.

Explanation

The speed of sound in vacuum is 0 m/s because sound cannot propagate in a vacuum as there is no medium for the sound waves to travel through.

Explanation

The minimum number of diodes required for full-wave rectification using a bridge rectifier is four.

Explanation

The efficiency of a Carnot engine will be maximum if T2 is equal to absolute zero (0 Kelvin).

Explanation

The photoelectric effect occurs at energies less than 0.5 MeV.

Explanation

If the capacitance C and resistance R of an RC circuit are given, τ= RC is the time constant (τ) of the circuit.

Explanation

In p-type semiconductors, a trivalent impurity is added, typically Boron.

Explanation

Questioning can stimulate curiosity, activate prior knowledge, and engage students in the topic before delving deeper into the lesson content.

Explanation

The direction of the magnetic field around most objects or magnets is from the north pole to the south pole.

Explanation

Passage

The sea-waves can cause a significant damage when they crash the lands. Under a clear sky and calm sea, a wall of water may appear twenty or thirty feet high over beaches, destroying houses and drowning residents in its path.

When a submarine earthquake happens, it is likely to cause an enormous amount of shock, disturbing the quite waters of the deep ocean. This disturbance transfers to the surface and forms a huge swell. The swells in the ocean are nearly a mile wide and rise to various multiple of ten feet in height.

Nothing was accomplished about tsunamis until after the second World War. These waves travel towards the land hundreds of miles an hour, and you can imagine that how they would crash!

Question 1: An aspect of the waves is the fact that they

(A) are produced by deep swells

(B) often strike during clear weather

(C) arise under conditions of cold temperature

(D) are formed in concentric patterns

Question 2: These destructive waves are caused by

(A) storms

(B) concentric time belts

(C) underwater earthquakes

(D) seismic changes

Question 3: The normal maximum width of the waves is approximately

(A) one mile

(B) five miles

(C) five feet

(D) ten feet

Question 4: Nothing was done about the waves until

(A) a solution was found

(B) deaths occurred

(C) severe damage was incurred

(D) the outbreak of World War II

Question 5: The motion of the waves has been calculated at a speed of

(A) 1 kilometer an hour

(B) 50 miles an hour

(C) 100 miles an hour

(D) more than a hundred miles an hour