10m
125m
175m
350m
1,000m
Correct answer is B
Difference in time = 1 sec.
echo time = 1 \(\div\) 2 = 0.5 sec.
= 0.5 x 250
= 125m
Which of the following statements about liquid pressure is NOT correct? The pressure
at a point in a liquid is proportional to the depth
at any point in a liquid is the same at the same level
is exerted equally in all directions at any point
of a liquid at any point on the wall of its container acts in a direction perpendicular to the wall
at a particular depth depends on the shape of the vessel
Correct answer is E
No explanation has been provided for this answer.
380g
400g
360g
39g
180g
Correct answer is A
R.d = 19, therefore, density = 19gcm-3
mass = velocity x density
= 20 x 19
= 380g
1.5 x 108m-1
2.0 x 108m-1
3.0 x 108m-1
4.5 x 108m-1
9.0 x 108m-1
Correct answer is B
n = \(\frac{\text{speed in air}}{\text{speed in glass}}\)
1.5 = \(\frac{3\times10^4}{\text{speed in glass}}\)
speed in glass = 2 x 108ms-1
The force with which an object is attracted to the earth is called its
acceleration
mass
gravity
impulse
weight
Correct answer is C
No explanation has been provided for this answer.