Light passes through a closed cylindrical tube containing a gas. If the gas is gradually pumped out, the speed of light inside the tube will
(a) increase
(b) decrease
(c) remain constant
(d) first increase and then decrease.
1 Answers
Talk Doctor Online in Bissoy App
A closed cylindrical tube containing some water (not filling the entire tube) lies in a horizontal plane.
(a) increases Explanation: During the above rotation water will move away from the axis of rotation. And the moment of inertia is directly proportional to the square of the distance of the mass from...
1 Answers 1 views
A beaker containing a liquid is kept inside a big closed jar. If the air inside the jar is continuously pumped out,
(b) decrease EXPLANATION: The pressure at the bottom of the liquid is the sum of atmospheric pressure and the pressure due to the height of the liquid. When the air inside the...
1 Answers 1 views
Water enters through end A with a speed 0, and leaves through end B with a speed u_2 of a cylindrical tube AB.
(d) each case. EXPLANATION: Since the water is incompressible, the volume of water entering end A and leaving through end B per unit time will remain constant in each case. Since the...
1 Answers 1 views
A closed vessel is half filled with water. There is a hole near the top of the vessel and air is pumped out from this hole.
(b) The pressure at the surface of the water will decrease. (c) The force by the water on the bottom of the vessel will decrease. EXPLANATION: The option (a) is not true because...
1 Answers 1 views
Water flows through two identical tubes A and B. A volume V_o of water passes through the tube A and 2 V_o through B in a given time.
(a) Flow in both the tubes are steady. (b) Flow in both the tubes are turbulent. (c) Flow is steady in A but turbulent in B. EXPLANATION: Since double the volume passes in B at the same time,...
1 Answers 1 views
A cylindrical tube, open at both ends, has a fundamental frequency v. The tube is dipped vertically in water so that ,
The correct answer is (c) v EXPLANATION: When a tube of length L open at both ends has a fundamental frequency ν, then v = V/2L where V is the velocity of...
1 Answers 1 views
Suppose the glass of the previous problem is covered by a jar and the air inside the jar is completely pumped out. (a) What will be
(a) In this case the atmospheric pressure on the surface of the water = zero. Hence, the pressure of water at the bottom of the glass =ρgh =1000*10*(20/100) N/m² =2000 N/m² Hence the...
1 Answers 1 views
A closed cylindrical tube containing some water (not filling the entire tube) lies in a horizontal plane,
(a) increases Explanation: During the above rotation water will move away from the axis of rotation. And the moment of inertia is directly proportional to the square of the distance of the...
1 Answers 1 views
Water flows through two identical tubes A and B. A volume V0 of water passes through the tube A and 2V0 through B in a given time,
(a) Flow in both the tubes are steady. (b) Flow in both the tubes are turbulent. (c) Flow is steady in A but turbulent in B. EXPLANATION: Since double the volume passes in B at...
1 Answers 1 views
Look around and find out how water is pumped up from the ground to higher places.
These days water is pumped up using boring machines, windmill etc. Somewhere, especially in villages, traditional method like using bullocks are also used.
1 Answers 1 views