The apparent frequency in Doppler's effect does not depend upon:
speed of the observer
distance between observer and source
speed of the source
frequency from the source
Two simple pendulums whose lengths are 100 cm and 121 cm are suspended side by side. Their bobs are pulled together and then released. After how many minimum oscillations of the longer pendulum, will the two be in phase
11
10
21
20
A body executing SHM has its velocity 10 cm/s and 7 cm/s when its displacements from the mean position are 3 cm and 4 cm respectively. The length of the path is :
10 cm
9.5 cm
4 cm
11.36 cm
A 700 g solid cube having an edge of length 10 cm floats in water. The volume of the cube outside water is :
2.4 cm3
4.8 cm3
300 cm3
500 cm3
A one-metre long steel wire of cross-sectional area 1mm2 is extended by 1 mm. If Y=2 x 1011 N/m2, then the work done is :
0.1 J
0.2 J
0.3 J
0.4 J
A light source approaches the observer with a velocity of 0.5 c. Doppler's shift for a light of wavelength 5500 Å is:
616 Å
1833 Å
5500 Å
6160 Å
At 27°C, a motor car tyre has a pressure of 2 atmospheres. The temperature at which the tyre suddenly burst will be : (Given: γair = 1.4)
246.1 K
250 K
246 K
248 K
Consider the following equation of Bernoulli's theorem
(constant)
The dimensions of K/P are same as that of which of the following?
Thrust
Pressure
Angle
Viscosity
C.
Angle
So, according to the principle of homogeneity. Dimensions of K = Dimensions of P
:. K/P will be dimensionless.
Thus, dimensions of K/P will be same as that of angle (because the angle is also dimensionless quantity)
Why the dam of the water reservoir is thick at the bottom?
Quantity of water increases with depth
Density of water increases with depth
Pressure of water increases with depth
Temperature of water increases with depth
A beaker is completely filled with water at 4°C. It will overflow if:
heated above 4°C
cooled below 4°C
both heated and cooled above and below 4°C respectively
none of these