Page 124 - Physics

Physics for Secondary Schools
(iv) The sea water is denser than
freshwater due to:
(a) mixing of sand.
(b) stagnation.
(c) mixing salts.
(d) evaporation.
(v) Which of the following methods
should be adopted in measuring the
volume of the liquid displaced by a
solid using a measuring cylinder?
solid using a measuring cylinder?
I II III IV
Figure 5.17
(a) The solid should hang above
the liquid surface in the jar, as
in Figure 5.17 (III).
(b) The solid should be well inside
the liquid, as in Figure 5.17 (I).
(c) Just rest at the surface of a liquid
in the cylinder, as in Figure 5.17
(IV).
(d) The solid should be half
immersed in liquid, as in Figure
5.17 (II).
(vi) A scuba diver wants to stay
motionless at a specifi c depth in the
water. What should the diver do to
achieve this?
(a) Add weights to become more
negatively buoyant.
(b) Infl ate the buoyancy control
device (BCD) to become more
118
Physics Form 1 Final.indd 118
positively buoyant.
(c) Do not make any adjustments;
the diver will automatically
maintain neutral buoyancy.
(d) Kick their legs continuously to
stay in place.
(vii) A student wants to compare the
densities of two different liquids.
Which instrument should the student
use for a direct comparison?
(a) Barometer
(b) Thermometer
(c) Hygrometer
(d) Hydrometer
(viii) A ship sailing in the sea enters a wide
and deep river. The density of seawater
3
is 1 100 kg/m , and the density of river
water is 1 000 kg/m .
3
Determine a comparison of the volume
of the object when it is in seawater to
that when in river water.
(a) 11 : 10
(b) 10 : 11
(c) 121 : 100
(d) 1 : 1
(ix) If the relative density of a substance is
11.3, the density of the substance is,
3
(a) 11.3 kg/m .
(b) 11.3 g/cm .
3
(c) 11.3×10 g/m .
-3
3
(d) 11.3 × 10 g/cm .
3
3
(x) How can a fi sh maintain its depth
in water without continuously
swimming?
(a) Fish have strong muscles that
keep them suspended in water.
(b) Fish have specialized air sacks
Student’s Book Form One
16/10/2024 20:57