# Buoyant Force Questions

## Physics lesson, buoyant force subject. Calculation of the buoyant force that exert to the objects floating, sinking and stay suspended. Questions and its solutions.

Question – 1

A body whose density is unknown floats in X liquid. The segments of the X are equal. The density of the liquid is 1.2 g/cm3.

What is the density of the body which floating in the liquid.

(g = 10 m/s2)

A) 0,3               B) 0,6               C) 0,9

D) 1                  E) 1,2

Question – 2

The K and L bodies whose density are unknown are balanced in the X liquid, as the above figure.

Density of the K body is 0.8 g/cm3.

What is the density of the L object.

A) 0,5                B) 0,8               C) 1,4

D) 1,8                E) 2,13

Question – 3

The K object whose density is unknown is balanced in the X and Y liquids, as in the figure-1 and the figure-2 above.

The density of the X liquid is 800 kg/m3.

How many kg/m3 the density of the Y liquid?

A) 800                  B) 1200               C) 1600

D) 1800                E) 2000

Question – 4

The K object is balanced in the X liquid, as in the figure-1. The segments of the K object are equal and the volume of each is 200 cm3.

If the L object is put over the K object, then the K and L objects are balanced as in the figure-2.

The density of the X liquid is 1.5 g/cm3.

What is the density of the L object?

(g = 10 m/s2)

A)2                  B) 1.5                 C) 1.2

D) 1                 E) 0.8

Question – 5

Which of the following options is wrong?

A) The buoyant force applied to object which suspended in the liquid is equal the weight of the object.

B) The density of suspended object in liquid is equal to the density of the liquid.

C) The buoyant force applied to sinking body in the liquid is smaller than the weight of the body.

D) The magnitude of the buoyant force applied to the floating objects is found by multiplying the volüme of the object and the density of the liquid.

E) The buoyant force applied to the floating object on the liquid is equal to the weight of this object.

Question – 6

The weight of an object is 100 N in air environment. If the object weigh out in X liquid with density of 1200 kg/m3, the dynamometer indicates 40 N.

If the object is weigh out in a liquid with density of 2000 kg/m3, what value does the dynamometer indicates.

(g = 10 m/s2)

A)0                   B) 8                   C) 12

D) 18                E) 24

Solutions of These Questions

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23/08/2018

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