1.
Define (a)1 Pascal (b) Relative Density (c) Density
(d) Buoyant Force/ Upthrust
2.
What are the factor on which the
buoyant force and relative density of a substance depends on?
3.
In what direction does the buoyant force on an
object immersed in a liquid act?
4.
When an iron nail is placed on the
surface of water it sinks whereas ship made up of iron floats.
5.
Why will a sheet of paper fall slower than one that
is crumpled into a ball?
6.
Why a block of plastic does released under water
come up to the surface of water?
7.
What is meant by the statement
relative density of gold is 19.3?
8.
Why does water pressure increase as
the depth of the water increases?
9.
Why is it difficult to hold a school
bag having a strap made of a thin and strong string?
10.
What are Plimsoll Lines?
11.
State Archimedes’ Principle. Based on this
principle, write its two applications. Is it applicable to gases?
12. The weight
of a man is 690N which contains 5.3
x 10-3 m3 of blood. Find
(a)
blood's weight. Take density of blood is 1060
kg/m3
(b) express it as percentage of body weight.
13.
The pressure
at the bottom of a filled glass (density = 1000 kg/m3) of water is P. The water is taken out and the glass is filled with
kerosene oil (density = 817.5 kg/m3). Now the pressure at the bottom will be
a.
same as P b. smaller
than P c. larger than P d. cannot be determined.
14.
The figure shows four containers containing a
liquid at same height. Rank them according to the pressure exerted by the
liquid on the bottom of the containers in ascending order.
a. 1, 2, 3, 4 b. 4. 3, 1, 2 c. 3, 4, 1, 2 d. same pressure in each case.
15. You find your mass to be 42 kg on a weighing machine. Is your mass more or less than 42 kg?
16. As you
climb up a mountain, your ears “pop” because of the changes in atmospheric
pressure. In which direction, outward or inward, does your eardrum move when
you climb up?
17.
Loaded test-tube placed in pure milk sinks to a certain
mark (M). Now some water is mixed with the milk. Will the test tube sink more
or less? Explain.
18.
Mass of a rectangular bar of iron piece is 320 g.
Its dimensions are 2 × 2 × 10 cm3. What is its
specific
gravity? Will the bar float or sink in water?
19.
The volume of 50 g of a substance is 20 cm3.
If the density of water is 1 g cm-3, will the substance float
or sink?
20.
The volume of a 500 g sealed packet is 350 cm3.
Will the packet float or sink in water if the density of water is 1 g cm-3?
What will be the mass of the water displaced by this packet?
21.
The weight of an empty glass is 1 N. When completely
filled with water, the glass weighs 4 N. If you now throw the water away and
fill the glass partly with sand, the weight becomes 4 N. If the rest of the
glass is now filled up with water, the weight becomes 6 N. What is the relative
density of sand?
1.
A solid weigh 75 g
in air and 55.6 g in water. Find the relative density?
2.
A cubical block of side 2 cm is lying
on a table. If the density of the material of 10,000kg/m3.Find the
pressure exerted by the block on the table.
3.
A solid
weights 100g in air, 75g in water and 70g in oil. Calculate the
relative density of the oil and solid.
4.
The mass of a solid iron cube of
side 4 cm is to be determined. Out of the four spring balances
available, the one best suitable for this purpose would have what range?
Density of iron is 7.8 g/cc.
5.
Balance A has a range of 0 to 250
g and a least count of 2.5 g, while balance B has a range of 0 to 1000 g
and a least count of 10g. Which balance would be the preferred option for mass
measurement of the cubes?
(a) Balance A for both the cubes
(b) Balance B for both the cubes
(c) Balance A for the Aluminum cube and balance B for Iron cube
(d) Balance A for the iron cube and balance B for aluminum cube.
6.
A cube of side 5cm is immersed in
water and then in saturated salt solution. In which case will it experience a
greater buoyant force? If each side of the cube is reduced to 4cm and then
immersed in water compare the force experienced by the cube, as compared to the
first case. Give reasons for each case.
7.
In an experiment finding volume of a
solid by immersing into water, the initial reading of water level in graduated
cylinder was 16.2 ml. On immersing the solid
8.
A 200 g wt. solid block of Aluminum
(density Al= 2.70 g / cc) is placed in a break of water filled to the brim.
Some water over flows. The same is done in another beaker with a 200 g solid
block of lead (density lead = 11.3 g / cc). Compare amount of water displayed
by block of Aluminum and block of lead.
9.
If you are given a spring of volume 33cm3.
if you are asked to select a best suited spring balance to determine its weight
then what should be the range of the spring balance ( the sphere is made of
alloy of density 7 g cm-3
10.
An iron ball of density 7800kg/m3
and volume 200cm3 is totally immersed in water (g = 10m/s2)
Find:
a. weight of iron ball in water
b. calculate up thrust
c. apparent weight in water d.
Apparent density in water
11.
A loaded test-tube placed in pure milk
sinks to a certain mark (M). Now some water is mixed with the milk. Will the
test tube sink more or less? Explain.
12.
A 600N clown on stilts says to two
600N clowns sitting on the ground, “I am exerting twice as much
pressure as the two of you together! “ Could this statement be true? Explain
your reasoning
13.
A student is performing
the experiment 'to determine the density of solid (denser than
water), by using spring balance and measuring cylinder'. During
the experiment, he observed that a few air bubbles were sticking to the
solid when immersed in water. What will the presence of air bubbles lead
to?
14.
A body weighs 20gf in air, 18.2 gf in
a liquid and 18.0 gf in water. Calculate (i) the relative density of the body
(ii) and relative density of the liquid.
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