The temperature of equal masses of three different liquids A, Band Care 12°C, 19°C and 28°C respectively. The temperature when A and B are mixed is 16°C and when B and C are mixed is 23°C. The temperature when A and C are mixed is
18.2°C
22°C
20.2°C
24.2°C
A particle starts SHM from the mean position. Its amplitude is a and total energy E. At one instant its kinetic energy is 3 · Its displacement at that instant is
A particle executes linear simple harmonic motion with an amplitude of 2 cm. When the particle is at 1 cm from the mean position the magnitude of its velocity is equal to that of its acceleration . Then its time period in second is
A closed organ pipe and an open organ pipe are tuned to the same fundamental frequency. The ratio of their lengths is
1 : 1
2 : 1
1 : 4
1 : 2
An observer standing near the sea shore 54 min. If the wavelength of the water wave is 10 m, then the velocity of water wave is
540 ms-1
5.4 ms-1
0.184 ms-1
9 ms-1
A set of 24 tuning forks are so arranged that each gives 6 beats/s with the previous one. If the frequency of the last tuning fork is double than that of the first, frequency of the second tuning fork is
138 Hz
132 Hz
144 Hz
276 Hz
A 10 Ω electric heater operates on a 110 V line. The rate at which heat is developed in watts is
1310 W
670 W
810 W
1210 W
D.
1210 W
For a certain thermocouple, if the temperature of the cold junction is 0°C, the neutral temperature and inversion temperatures are 285°C and 570°C respectively. If the cold junction is brought to 10°C, then the new neutral and inversion temperatures are respectively
285°C and 560°C
285°C and 570°C
295°C and 560°C
275°C and 560°C
In which of the following substances does resistance decrease with increase in temperature ?
Copper
Carbon
Constantan
Silver