I and II only
II and IV only
I,II and IV only
I,II,III and IV
Correct answer is A
Air pressure has no effect on speed of sound in an ideal gas because pressure and density both contribute to sound velocity equally, the two effects cancel each other out
The radiator of a motor car is cooled by
radiation
conduction
convection
radiation and conduction
Correct answer is C
The function of the radiator of a motor car is to "collect" heat from the circulating water and radiate some out, but it is itself cooled by the fan adjacent to it. whose function is primarily based on convection
3 cm
5 cm
6 cm
8 cm
Correct answer is A
Real depth = thickness of the glass block = 9cm.
Refractive index of the glass material = 1.5
But Refractive index = Real depth/Apparent depth
=> 1.5 = 9/Apparent depth
therefore Apparent depth = 9/1.5 = 6cm.
therefore Apparent displacement of the Coin = 9.6
= 3cm
The effect of a particle in a fluid attaining its terminal velocity is that the
acceleration is maximum
weight is equal to the retarding force
buoyancy force is equal to the to the viscous retardind force
buoyancy force is more than the weight of the fluid displaced
Correct answer is B
No explanation has been provided for this answer.
A particle in circular motion performs 30 oscillation in 6 seconds. Its angular velocity is
5 rad s-1
6 rad s-1
5π rad s-1
10π rad s-1
Correct answer is D
Angular velocity w = 2π f.
But f = frequency no. of oscillations per second.
= 30/6 = 5Hz.
therefore W = 2π x 5
= 10π rad. s-1