Physics Test 108

Result

Physics Test 108

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Weekly Quiz Competition

Question 1
4 / -1

The height at which the acceleration due to gravity decreases by 36% of its value on the surface of the earth is :

(Assume radius of the earth is R)

A
R/4

B
R/2

C
R/6

D
4 R

Solution
Question 2
4 / -1

Two wires, one of steel (Y_steel = 2 × 10¹¹ N/m²) and the other of copper (Y_Cu = 10¹¹ N/m²) have same length and radii. If on applying a force F, the length of first wire increases by ℓ₀, then force required to increase the length of second wire by same amount is :-

A
4F

B
F/4

C
F/2

D
2F

Solution

As length of both wires increases by same amount
Δℓ₁ = Δℓ₂
Question 3
4 / -1

There are two identical small holes of area of cross-section a on the opposite sides of a tank containing a liquid of density ρ. The difference in height between the holes is h. Tank is resting on a smooth horizontal surface. Horizontal force which will have to be applied on the tank to keep it in equilibrium is–

A
g h ρa

B
2gh / ρa

C
2g h ρa

D
ρgh / a

Solution
Question 4
4 / -1

Two drops of equal radius are falling through air with a steady velocity of 5 cm/s. If the two drops coalesce, then its terminal velocity will be –

A

B

C

D

Solution

when 2 droplets of radius r coalesce the new radius R of the big drop will be given by
Question 5
4 / -1

The total energy of a simple harmonic oscillator is proportional to :-

A
amplitude

B
square of amplitude

C
frequency

D
velocity

Solution

In SHM, the total energy is
E =

where the symbols have their usual meanings.

E ∝ A²
Question 6
4 / -1

The time period of second's pendulum is 2 sec. The spherical bob which is empty from inside has a mass of 50 gm. This is now replaced by another solid bob of same radius but having different mass of 100 gm. the new time period will be :-

A
4 sec

B
1 sec

C
2 sec

D
8 sec

Solution

Independent of mass.
Question 7
4 / -1

A heavy rope is suspended from a rigid support. A wave pulse is set up at the lower end; then :-

A
the pulse will travel with uniform speed

B
the pulse will travel with increasing speed

C
the pulse will travel with decreasing speed

D
the pulse cannot travel through the rope

Solution

as pulse move up tension increases so speed of the pulse will increase as it will move up
Question 8
4 / -1

A sound has an intensity of 2 × 10^–8 W/m². Its intensity level (in decibel) is : (log₁₀2 = 0.3) :-

A
23

B
3

C
43

D
4.3

Solution
Question 9
4 / -1

Directions For Questions

Four simple harmonic vibrations :-

...view full instructions

are superposed on each other. The resulting amplitude and phase are respectively:

A
√45 and tan^–1(1/2)

B
√45 and tan^–1(1/3)

C
√75 and tan^–1(1/2)

D
√75 and tan^–1(1/3)

Solution
Question 10
4 / -1

A cylinder of radius R made of material thermal conductivity K₁ is surrounded by a cylinderical shell of inner radius 2R made of material of thermal conductivity K₂. The two ends of combined system are maintained at two different temperature. There is no loss of heat & system is in steady state, calculate effective thermal conductivity of system :-

A

B
K₁ + K₂

C

D

Solution