Physics Test 269

Result

Physics Test 269

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Weekly Quiz Competition

Question 1
4 / -1

In aqueous solution the ionization constants for carbonic acid are K₁ = 4.2 x 10^-7 and K₂ = 4.8 x 10^-11 Selection the correct statement for a saturated 0.034 M solution of the carbonic acid.

A

B

C

D

Solution
Question 2
4 / -1

A planet of mass M is revolving around sun in an elliptical orbit. If dA is the area swept in a time dt, angular momentum can be expressed as

A

B

C

D

Solution
Question 3
4 / -1

A particle is projected upward from the surface of earth (radius = R) with a speed equal to the orbital speed of a satellite near the earth’s surface. The height to which it would rise is

A
√2R

B
R/√2

C
R

D
2R

Solution
Question 4
4 / -1

A spherical hole is made in a solid sphere of radius R. The mass of the original sphere was M.The gravitational field at the centre of the hole due to the remaining mass is

A
zero

B
GM/8R²

C
GM/2R²

D
GM/R²

Solution
Question 5
4 / -1

Three particles P, Q and R placed as per given figure. Masses of P, Q and R are √3 m, √3 m and m respectively. The gravitational force on a fourth particle ‘S’ of mass m is equal to

A

B

C

D

Solution
Question 6
4 / -1

A uniform ring of mass M and radius R is placed directly above uniform sphere of mass 8M and of same radius R. The centre of the ring is at a distance of d = √3R from the centre of sphere. The gravitational attraction between the sphere and the ring is

A

B

C

D

Solution

Gravitational field due to the ring at a distance d = √3R on its axis is:
Question 7
4 / -1

Directions For Questions

A cylindrical tank has a hole of diameter 2r in its bottom. The hole is covered wooden cylindrical block of diameter 4r, height h and density ρ/3.

Situation I : Initially, the tank is filled with water of density ρ to a height such that the height of water above the top of the block is h₁ (measured from the top of the block).

Situation II : The water is removed from the tank to a height h₂ (measured from the bottom of the block), as shown in the figure.

The height h₂ is smaller than h (height of the block) and thus the block is exposed to the atmosphere.

...view full instructions

Find the minimum value of height h₁ (in situation 1), for which the block just starts to move up?

A
2h/3

B
5h/4

C
5h/3

D
5h/2

Solution
Question 8
4 / -1

Directions For Questions

A spray gun is shown in the figure where a piston pushes air out of a nozzle. A thin tube of uniform cross section is connected to the nozzle. The other end of the tube is in a small liquid container.

As the piston pushes air through the nozzle, the liquid from the container rises into the nozzle and is sprayed out. For the spray gun shown, the radii of the piston and the nozzle are 20 mm and 1 mm respectively. The upper end of the container is open to the atmosphere.

...view full instructions

If the piston is pushed at a speed of 5 mms^–1, the air comes out of the nozzle with a speed of

A
0.1 ms^–1

B
1 ms^–1

C
2 ms^–1

D
8 ms^–1

Solution
Question 9
4 / -1

A piece of copper having a rectangular cross-section of 15.2 mm × 19.1 mm is pulled in tension with 44,500 N force, producing only elastic deformation. Calculate the resulting strain? Take Young's modulus of copper as 42 × 10⁹Pa

A
3.65 × 10^-8

B
3.65 × 10^-3

C
3.65 × 10^-9

D
3.65 × 10^-2

Solution
Question 10
4 / -1

If the elastic limit of copper is 1.5 × 10⁸ N/ m², determine the minimum diameter a copper wire can have under a load of 10.0 kg if its elastic limit is not to be exceeded.

A
1.012 mm

B
0.912 mm

C
0.712 mm

D
0.812 mm

Solution