Parabolic mirrors
Plane mirrors
Cylindrical mirrors
Spherical mirrors
Correct answer is A
No explanation has been provided for this answer.
In which of the following material media will sound travel fastest?
oil
metal
gas
water
Correct answer is B
No explanation has been provided for this answer.
1:80
1:320
1:1280
1:4
Correct answer is A
NOTE: Firstly, it should be noted that the mass, as well as the weight of a body is independent of its size.
∴ Let the weight of the moon = Mm x gm
weight of the earth = Me x ge
But ge = 80gm
∴ weight of the earth = Me x 80gm
=> weight of the moon / weight of the earth = Mm x gm / Me x 80gm
thus Mm/Me ∝ gm/80gm ∝ 1/80
=> Mm:Me ∝ 1:80
13N
17N
√3N
7√3N
Correct answer is A
Component of 8N along the horizontal = 8 cos 60o = 8 x 0.5
= 4N
Similarity Component of 6N along the horizontal = 6 cos 60o = 3N
∴ Total force towards the right = 10 + 4 + 3
= 17N
Again total force toward the left = 4N
∴ Net horizontal force (towards the right) = 17-4
= 13N
As the pressure of a fluid increases, its viscosity
decreases
increases
increases then decreases
remains constant
Correct answer is B
No explanation has been provided for this answer.
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