Physics Test 79

Result

Physics Test 79

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Weekly Quiz Competition

Question 1
4 / -1

Two point masses of mass 4m and m respectively separated by d distance are revolving under mutual force of attraction. Ratio of their kinetic energies will be :-

A
1 : 4

B
1 : 5

C
1 : 1

D
1 : 2

Solution

KE₁/ KE₁= 1/1
Question 2
4 / -1

A wire elongates by ℓ mm when a load W is hanged from it. If the wire goes over a pulley and two weights W each are hung at the two ends, the elongation of the wire (in mm) is nℓ then the value of n is :-

A
1

B
2

C
3

D
4
Question 3
4 / -1

One end of a uniform wire of length L and of weight W is attached rigidly to a point in the roof and a weight W₁ is suspended from its lower end. If S is the area of cross-section of the wire, the stress in the wire at a height 3L/4 from its lower end is :

A
W₁/ S

B
W₁+ (W/4) / S

C
W₁+ (3W/4) / S

D
W₁+ W / S
Question 4
4 / -1

In a surface tension experiment with a capillary tube water rises upto 0.1 m. If the same experiment is repeated on an artificial satellite, which is revolving around the earth, water will rise in the capillary tube upto a height of :

A
0.1 m

B
0.2 m

C
0.98 m

D
Full length of the capillary tube

Solution

In the satellite, the weight of the liquid column is zero. So the liquid will rise up to the top of the tube.
Question 5
4 / -1

In Young's experiment, if the amplitude of interferring waves are unequal then the :

A
contrast in the fringes decreases

B
contrast in the fringes increase

C
number of fringes will increase

D
number of fringes will decrease