Physics Test 13...

Water is filled up to a height 'h' in a cylindrical vessel. Now, a hole of area 'A' is made at bottom of the vessel. Water drains out of the hole in time 't' seconds. If we repeat the above process with a height of water as '4h', then how much time it require for water to drain out of the cylinder?
[Assume A << A₀  (area of tank)]

Which of the following graphs correctly represent the variation of β = −[(dV/dp)/V] with p for an ideal gas at constant temperature?

What is the potential difference between A and B?

(where A is the centre of left ring and B is the centre of right ring)

Half-life of a radioactive substance A is 4 days. The probability of a nucleus that,  from the given sample that it will decay in two half-lives is

Which of the following statement is false for electromagnetic waves ?

The voltage of clouds is 4 × 10⁶ V with respect to ground. In a lightning strike lasting 100 ms, a charge of 4 C is delivered to the ground. The average power of lightning strike is (assume complete discharges)

A tuning fork vibrates with a frequency of 256 Hz. Taking the speed of sound to be 345.6 m s^-1 in the air, find the wavelength and the distance, which the sound travels during the time, fork makes 60 vibrations.

If the radius of the earth were to shrink by one percent and its mass remains the same, the acceleration due to gravity on the earth's surface would

Six wires of current I₁ = 1A, I₂ = 2A, I₃ = 3A, I₄ = 1A, I₅ = 5A and I₆ = 4A cut the page perpendicularly at the points 1,2,3,4,5 and 6 respectively as shown in the figure. Find the value of integral ∮B→.dℓ around the circular path c.

Three capacitors each of capacity 4 μF are to be connected in such a way that the effective capacitance is 6 μF. This can be done by