Physics Test 160

Result

Physics Test 160

Score
-
out of -
Rank
-
out of -

TIME Taken - -

SHARING IS CARING

If our Website helped you a little, then kindly spread our voice using Social Networks. Spread our word to your readers, friends, teachers, students & all those close ones who deserve to know what you know now.

Weekly Quiz Competition

Question 1
4 / -1

A garden sprinkler has 150 small holes, each of 2 mm² area. If water is supplied at the rate of 0.3 litres/s, then find the average velocity of the spray.

A
300 cm/s

B
22.5 cm/s

C
0.1 cm/s

D
100 cm/s

Solution

We know by the conservation of volume we get that

0.3 L/sec = 150 x 0.02 cm² x v

Where v is the speed of the spray,

And we know 1L = 1 cm³

Hence we get v = 150 x 0.02 cm² / .3 cm³/s

= 100 cm²/s
Question 2
4 / -1

If pressure at half the depth of a lake is equal to 2/3 pressure at the bottom of the lake then what is the depth of the lake

A
10 m

B
20 m

C
60 m

D
30 m

Solution

Pressure at bottom of the lake = P₀ + hρg

Pressure at half the depth of a lake = P₀ + h/2 ρg

According to given condition
Question 3
4 / -1

An inverted bell lying at the bottom of a lake 47.6 m deep has 50 cm of air trapped in it. The bell is brought to the surface of the lake. The volume of the trapped air will be (atmospheric pressure = 70 cm of Hg and density of Hg = 13.6 g/cm)

A
350 cm

B
300 cm

C
250 cm

D
22 cm

Solution

According to Boyle's law, pressure and volume are inversely proportional to each other i.e. P ∝ 1/V
Question 4
4 / -1

If two liquids of same masses but densities ρ₁ and ρ₂ respectively are mixed, then density of mixture is given by

A

B

C

D

Solution
Question 5
4 / -1

A hemispherical bowl just floats without sinking in a liquid of density 1.2 x 10 kg/m. If outer diameter and the density of the bowl are 1 m and 2 x 10 kg/m respectively, then the inner diameter of the bowl will be

A
0.94 m

B
0.97 m

C
0.98 m

D
0.99 m

Solution
Question 6
4 / -1

A ball whose density is 0.4 x 10 kg/m falls into water from a height of 9 cm. To what depth does the ball sink

A
9 cm

B
6 cm

C
4.5 cm

D
2.25 cm

Solution
Question 7
4 / -1

Two solids A and B float in water. It is observed that A floats with 1/2 of its body immersed in water and B floats with 1/4 of its volume above the water level. The ratio of the density of A to that of B is

A
4 : 3

B
2 : 3

C
3 : 4

D
1 : 2

Solution

Upthrust = weight of body
Question 8
4 / -1

A manometer connected to a closed tap reads 3.5 × 10 N/m. When the valve is opened, the reading of manometer falls to 3.0 × 10 N/m, then velocity of flow of water is

A
100 m/s

B
10 m/s

C
1 m/s

D
10√10 m/s

Solution
Question 9
4 / -1

A large tank filled with water to a height 'h' is to be emptied through a small hole at the bottom. The ratio of time taken for the level of water to fall from h to h/2 and from h/2 to zero is

A
√2

B
1/√2

C
√2 - 1

D

Solution
Question 10
4 / -1

A ball of radius r and density ρ falls freely under gravity through a distance h before entering water. Velocity of ball does not change even on entering water. If viscosity of water is η, the value of h is given by

A

B

C

D

Solution