Question

1 A rectangular block of metal of density 8000 kg/m3 measures 2cm by 3 cm by 10 cm. What is the mass of the block?

4.8 kg
48 kg
48 g
0.48 kg

2 Which of the following will exert the greatest pressure when standing on the ground?

ballerina: Weight 450 N, on one point, area 0.0015 m2
atmospheric pressure: 105 Pa
man: weight 800 N, area of one foot 0.025 m2
an elephant: weight 50,000 N, area of one foot 0.2 m2
3 Which of the following descriptions most accurately describes a gas?

very low density, easily compressed, cannot flow
high density, cannot be compressed, definite shape
very low density, easily compressed, expands to fill available space
high density, difficult to compress, can flow
4 The specific heat capacity of a liquid is

the amount of heat energy required to make 1 kilogram of the liquid boil
the amount of heat energy required to raise the temperature of 1 kilogram of the liquid by 1°F
The amount of heat energy required to raise the temperature of 1 kilogram of the liquid by 1°C
the amount of heat energy required to raise the temperature of 1000 cm3 of the liquid by 1°C
5 Boyle’s law states that

if you double the pressure on a gas its volume doubles
if you double the pressure on a gas its temperature halves
if you double the pressure on a gas its volume doubles provided its temperature is constant
if you double the pressure on a gas its volume halves provided its temperature is constant

Answer 1

1. Mass = Density X Volume = 8000 X 60/1000000 = 0.48kg = (d)

2. Pressure exerted by Ballerina = 450/0.0015 = 45,00,000/15 = 3,00,000Pa

               Atmospheric pressure = 105 Pa

                                              Man = 800/0.025 = 8,00,000/25 = 32000Pa

                                      Elephant = 50,000/0.2 = 5,00,000/2 = 2,50,000Pa

So the pressure exerted by ballerina that is 3,00,000Pa is the highest.

                                                 (a)

3. (c)

4. (b)

5. (d)