Physics Test 94

Result

Physics Test 94

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Weekly Quiz Competition

Question 1
4 / -1

Two wires A and B have the same length and area of cross–section, but the Young's modulus of A is two times the Young's modulus of B. Then the ratio of force constant of A to that of B is :–

A
1

B
2

C
√2

D
1/2

Solution
Question 2
4 / -1

A ball of relative density 0.8 falls into water from a height of 2m. The depth to which the ball will sink is (neglect the viscous force) :–

A
2m

B
4m

C
7m

D
8m

Solution
Question 3
4 / -1

Reynolds's number is explained by which relation:-

A

B

C

D
Question 4
4 / -1

Modulus of rigidity of ideal liquid is :-

A
Infinite

B
Zero

C
Unity

D
Some finite small non–zero constant value
Question 5
4 / -1

The maximum load a wire can with stand without breaking, when it's length is reduced to half of it's original length, will be :-

A
Two times

B
Halved

C
Four times

D
Unchanged

Solution

Breaking stress of a wire does not depend on it's length.
Question 6
4 / -1

For the shown diagram, find range of liquid coming out from small hole :-
(g = 10 m/s²)

A
5m

B
12.6m

C
8.7m

D
10m

Solution
Question 7
4 / -1

64 water drops are combined to form a big drop surface energy of big drop is m times of any small drop. m is :–

A
16

B
8

C
4

D
2

Solution

Surface energy of a drop
E_s = 4πr² × T
For big drop E_B = 4πR²T where R = n^1/3r
E_B = 4π(4r)²T = 16 × 4πr²T R = (64)^1/3r
E_B=16E_s as E_B=mE_s (given) R = 4r
so m = 16
Question 8
4 / -1

Find increase in length of the rod under shown situation :-

A

B

C

D

Solution
Question 9
4 / -1

A metal sphere of radius R and density ρ is immersed in a liquid of density σ(< ρ). Now a spherical cavity is made inside the sphere, for what minimum radius of cavity it will float in liquid ?

A

B

C

D

Solution
Question 10
4 / -1

When a capillary tube is immersed into liquid, the liquid neither rises nor falls in the capillary :- (Correct option/options are)

(a) The angle of contact may be 0°

(b) The angle of contact may be 90°

(c) The surface tension of liquid may be infinite

(d) The surface tension of liquid may be zero

A
a, c

B
a, d

C
b, c

D
b, d