Physics Test - ...

A stone dropped from the top of a tower reaches ground in \(4 \mathrm{~s}\). Height of the tower is \(\left(g=10 \mathrm{~m} / \mathrm{s}^{2}\right)\)

A car starting from rest is accelerated at a constant rate \(\alpha\) until it attains a speed \(v\). It is then retarded at a constant rate \(\beta\) until it comes to rest. The average speed of the car for its entire journey is:

The ratio of the root mean square speed, average speed and maximum possible speed for a gas will be:

A man increases his speed by 2m/s, then his kinetic energy gets doubled. The original speed of the man is:

Which of the following statement is incorrect regarding charge on the body?

If a transformer of an audio amplifier has an input impedance of 8Ω andoutput impedance of 8 kΩ, the primary and secondary turns of this transformer connected between the output of the amplifier and to loudspeaker should have the ratio

The electrostatic force of repulsion between two positively charged ions carrying equal charge is \(3.7 \times 10^{-9} N\), when they are separated by a distance of \(5 \mathring{A}\). How many electrons are missing from each ion?

Point of maximum positive displacement in a transverse wave is called:

What did Archimedes determine after discovering the Archimedes principle?

The centre of mass of three particle s of masses \(1 \mathrm{~kg}, 2 \mathrm{~kg},\) and \(3 \mathrm{~kg}\) is at \(2,2,2\) . The position of the fourth mass of \(4 \mathrm{~kg}\) to be placed in the system so that the new centre of mass is at \(0,0,0\) is