Question

section - a
tick the correct option :

1. which of the following is a true solution?

a) chalk in water b) sugar in water c) gel

1. cuboidal epithelium is found in

a) mouth b) bronchises c) food pipe

1. matter has ______ states.

a) 3 b) 5 c) 2

1. which of the following is an element?

a) c b) fes c) h₂

1. a body of mass 50kg is moving with acceleration 2 m/s²

a) 100 n b) 25 n c) 50 n
fill in the blanks :

1. evaporation causes ______
2. ______ connect a bone to muscle.
3. our heart have ______ muscle.
4. odometer of an automobile measures its ______
5. cell was discovered in ______

complete the formulae :

1. force = ______ * acceleration.
2. ______ = mass * velocity
3. v = ______ + at
4. concentration of solution =(mass of ______ / mass of solution )*100
5. 0°c = ______ k

classify the following into physical or chemical changes:
melting of ice - cream , burning of petrol in engine , rolling of chapatti , freezing of water , food
which of the following will show tyndall effect ?
salt solution , milk , copper sulphate , starch , air
write the units of following :
force , mass , velocity , momentum , displacement
section - b
one mark questions:

1. 470 k is equal to how many celcius?
2. what does the distance time graph look like for a body in uniform motion ?
3. which law explains the recoiling of gun?
4. write three equations of motion.
5. which cell organelle is known as power house of cell?
6. name the tissue that stores fat.
7. what is the boiling point of water ?
8. what is the measure of inertia?
9. draw the velocity time graph for a body in non - uniform accelerated motion.
10. convert 36 km/h into m/s.

two marks questions:

1. what are characteristics of particles of matter ?

Explanation:

Tick the correct option:

1.

- A true - solution is a homogeneous mixture. Sugar in water is a true solution as sugar dissolves completely in water forming a single - phase homogeneous mixture. Chalk in water is a suspension and gel is a colloid.
- Answer: b) Sugar in Water

2.

- Cuboidal epithelium is found in ducts of glands and tubular parts of nephrons in kidneys. It is not found in the mouth, bronchioles, or food pipe.
- Answer: None of the given options (Cuboidal epithelium is typically found in glandular ducts and kidney tubules)

3.

- Matter has 3 states: solid, liquid, and gas.
- Answer: a) 3

4.

- An element is a pure substance made up of only one type of atom. C (carbon) is an element. FeS is a compound and \(H_2\) is a molecule of an element but the question asks for an element symbol, so C is the correct answer.
- Answer: a) C

5.

- According to Newton's second law \(F = ma\), where \(m = 50kg\) and \(a=2m/s^{2}\). Then \(F=50\times2 = 100N\).
- Answer: a) 100 N

Fill in the Blanks:

1.

- Evaporation causes cooling.
- Answer: cooling

2.

- Tendons connect a bone to muscle.
- Answer: Tendons

3.

- Our heart has involuntary muscle.
- Answer: involuntary

4.

- Odometer of an automobile measures its distance travelled.
- Answer: distance travelled

5.

- Cell was discovered in 1665 by Robert Hooke.
- Answer: 1665

Complete the formulae:

1.

- \(Force = mass\times acceleration\).
- Answer: mass

2.

- \(Momentum=mass\times velocity\).
- Answer: Momentum

3.

- \(v = u+at\) (where \(v\) is final velocity, \(u\) is initial velocity, \(a\) is acceleration and \(t\) is time).
- Answer: u

4.

- Concentration of solution = (Mass of solute / Mass of solution )*100.
- Answer: solute

5.

- To convert from Celsius to Kelvin, \(K = ^{\circ}C+273\). So \(0^{\circ}C = 273K\).
- Answer: 273

Classify the following into physical or Chemical changes:

- Melting of ice - cream: Physical change (change of state from solid to liquid without change in chemical composition).
- Burning of petrol in engine: Chemical change (petrol reacts with oxygen to form carbon - dioxide, water etc., new substances are formed).
- Rolling of chapatti: Physical change (change in shape without change in chemical composition).
- Freezing of water: Physical change (change of state from liquid to solid without change in chemical composition).

Which of the following will show Tyndall Effect?

- Tyndall effect is shown by colloids. Milk is a colloid and will show Tyndall effect. Salt solution is a true - solution and will not show Tyndall effect, copper sulphate solution is a true - solution and will not show Tyndall effect, starch solution (if it is a colloid) can show Tyndall effect, air is a mixture and may show Tyndall effect in presence of dust particles etc. But among the given options, milk is the most common colloid.
- Answer: milk

Write the units of the following:

- Force: Newton (N)
- Mass: Kilogram (kg)
- Velocity: Metre per second (m/s)
- Momentum: Kilogram - metre per second (kg·m/s)
- Displacement: Metre (m)

ONE MARK QUESTIONS:

1.

- To convert Kelvin to Celsius, \(^{\circ}C=K - 273\). So for \(K = 470\), \(^{\circ}C=470 - 273=197^{\circ}C\).
- Answer: \(197^{\circ}C\)

2.

- For a body in uniform motion, the distance - time graph is a straight line with a constant slope.
- Answer: A straight line with constant slope

3.

- The recoil of a gun is explained by Newton's third law of motion which states that for every action, there is an equal and opposite reaction.
- Answer: Newton's third law of motion

4.

- The three equations of motion are \(v = u+at\), \(s=ut+\frac{1}{2}at^{2}\), \(v^{2}-u^{2}=2as\) (where \(u\) is initial velocity, \(v\) is final velocity, \(a\) is acceleration, \(t\) is time and \(s\) is displacement).
- Answer: \(v = u+at\), \(s=ut+\frac{1}{2}at^{2}\), \(v^{2}-u^{2}=2as\)

5.

- Mitochondria is known as the power - house of the cell as it is the site of cellular respiration and produces ATP (energy currency of the cell).
- Answer: Mitochondria

6.

- Adipose tissue stores fat.
- Answer: Adipose tissue

7.

- The boiling point of water at standard atmospheric pressure is \(100^{\circ}C\) or \(373K\).
- Answer: \(100^{\circ}C\) (or \(373K\))

8.

- The measure of inertia is mass.
- Answer: mass

9.

- For a body in non - uniform accelerated motion, the velocity - time graph is a curved line (since acceleration is non - constant, the slope of the velocity - time graph which represents acceleration is changing).
- Answer: A curved line

10.

- To convert \(36km/h\) to \(m/s\), we know that \(1km = 1000m\) and \(1h=3600s\). So \(36km/h=\frac{36\times1000}{3600}=10m/s\).
- Answer: \(10m/s\)

TWO MARKS QUESTIONS:

1.

- Characteristics of particles of matter:
- Particles of matter have space between them. For example, we can dissolve salt in water as the salt particles occupy the spaces between water particles.
- Particles of matter are continuously moving. This is evident from the phenomenon of diffusion. For example, the smell of perfume spreads in a room due to the continuous motion of its particles.
- Particles of matter attract each other. The force of attraction between particles of a solid is very strong, in liquids it is less strong and in gases it is very weak. For example, it is difficult to break a piece of iron (solid) due to strong inter - particle forces, while gases can be easily compressed as the inter - particle forces are weak.

Answer:

• Tick the correct option:
• 1. b) Sugar in Water
• 2. None of the given options
• 3. a) 3
• 4. a) C
• 5. a) 100 N
• Fill in the Blanks:
• 1. cooling
• 2. Tendons
• 3. involuntary
• 4. distance travelled
• 5. 1665
• Complete the formulae:
• 1. mass
• 2. Momentum
• 3. u
• 4. solute
• 5. 273
• Classify the following into physical or Chemical changes:
• Melting of ice - cream: Physical change
• Burning of petrol in engine: Chemical change
• Rolling of chapatti: Physical change
• Freezing of water: Physical change
• Which of the following will show Tyndall Effect? milk
• Write the units of the following:
• Force: Newton (N)
• Mass: Kilogram (kg)
• Velocity: Metre per second (m/s)
• Momentum: Kilogram - metre per second (kg·m/s)
• Displacement: Metre (m)
• ONE MARK QUESTIONS:
• 1. \(197^{\circ}C\)
• 2. A straight line with constant slope
• 3. Newton's third law of motion
• 4. \(v = u+at\), \(s=ut+\frac{1}{2}at^{2}\), \(v^{2}-u^{2}=2as\)
• 5. Mitochondria
• 6. Adipose tissue
• 7. \(100^{\circ}C\) (or \(373K\))
• 8. mass
• 9. A curved line
• 10. \(10m/s\)
• TWO MARKS QUESTIONS:
• 1. Particles of matter have space between them, are continuously moving and attract each other.