Two closed organ pipes of length 100 cm and 101 cm produces 16 beats in 20 sec. When each pipe is sounded in its fundamental mode. Calculate the velocity of sound.
303 ms-1
332 ms-1
323.2 ms-1
300 ms-1yes
A certain gas is taken to the five states represented by dots in the graph. The plotted lines are isotherms. Order of the most portable speed νp of the molecules at these five states is
νp at 3 > νp at 1 = νp at 2 > νp at 4 = νp at 5
νp at 1 > νp at 2 = νp at 3 > νp at 4 > νp at 5
νp at 3 > νp at 2 = νp at 4 > νp at 1 = νp at 5
insufficient information to predict the result
The equivalent resistance between the points X and Y in the following circuit diagram will be
10 Ω
5 Ω
7 Ω
3 Ω
Two heater wires, made of the same material and having the same length and the same radius, are first connected in series and then in parallel to a constant potential difference. If the rates of I heat produced in the two cases are Hs and HP respectively, then Hs/HP will be
1/2
2
1/4
4
Assertion: In the relation f = , where symbols have standard meaning, μ represents linear mass density.
Reason: The frequency has the dimensions of inverse of time.
If both assertion and reason are true and reason is the correct explanation of assertion
If both assertion and reason are true but reason is not the correct explanation of assertion
If assertion is true but reason is false
If both assertion and reason are false
Assertion: A needle placed carefully on the surface of water may float, whereas a ball of the same material will always sink.
Result: The buoyancy of an object depends both on the material and shape of the object.
If both assertion and reason are true and reason is the correct explanation of assertion
If both assertion and reason are true but reason is not the correct explanation of assertion
If assertion is true but reason is false
If both assertion and reason are false
C.
If assertion is true but reason is false
A needle placed carefully on the surface of water may float due to surface tension as upward force due to surface tension balances the weight of the needle. But these upward force due to surface tension are very small as compared to weight of ball. Also the weight of liquid displaced by the ball immersed in liquid is less than the weight of the ball, hence ball sinks into the liquid.
Assertion: In an SHM, kinetic and potential energies equal when the displacement is 1/ times the amplitude.
Reason: In SHM, kinetic energy is zero when potential energy is maximum.
If both assertion and reason are true and reason is the correct explanation of assertion
If both assertion and reason are true but reason is not the correct explanation of assertion
If assertion is true but reason is false
If both assertion and reason are false
In an electrical containing L, C and R which of the following does not denote the dimensions and frequency?
LC
The velocity of electromagnetic radiation in a medium of permittivity ε0 and permeability μ0 is given by