Directions: In the following questions, a statement of assertion is followed by a statement of reason.Mark the correct choice as:(a) If both Assertion and Reason are true and Reason is the correct explanation of Assertion. (b) If both Assertion and Reason are true but Reason is not the correct explanation of Assertion. (c) If Assertion is true but Reason is false.(d) If both Assertion and Reason are false. q. l. Assertion: Organisms are made up of cells.Reason: Cells are structural unit of living organisms. A cell keeps its chemical composition steady within its boundary. Option. A Option. B Option. C Option. D II.Assertion: Eukaryotic cells have membrane bound organelles,Reason: Prokaryotic cells lack membrane bound organelles. Option. A Option. B Option. C Option. D III.Assertion: Schleiden and Schwann were the first to observe the cells and to put forward cell theory.Reason: The cells are always living unit. Option. A Option. B Option. C Option. D IV..Assertion: Oxygen is an element.Reason: It cannot be decomposed by a physical or a chemical process Option. A Option. B Option. C Option. D V.Assertion True solutions exhibins Tyndall effect.Reason Particles are very small in size. Option. A Option. B Option. C Option. D VI.Assertjón (A):A solution is a homogeneous mixture of two or more substancesReason (R): A solution has a solvent and a solute as its components. Option. A Option. B Option. C Option. D VII.Assertion: The conversion of a gas directly into solid is called condensation. Reason: Naphthalene leaves residue when kept in open for some time Option. A Option. B Option. C Option. D VIII.Assertion: There is no change in the temperature of substance when it undergoes a change of state though it is still being heated. Reason: The heat supplied is absorbed either as latent heat of fusion or as latent heat of vaporization Option. A Option. B Option. C Option. D IX. Assertion: The intermolecular forces in solid state are stronger than those in the liquid state. Reason: The space between the particles of matter is called intermolecular space. Option. A Option. B Option. C Option. D X. Assertion: The Speedometer of a car or a motorcycle measures its average speed. Reason: Average velocity is equal to displacement divided time taken.. Option. A Option. B Option. C Option. D XI.3. Assertion: Displacement of 1 point a body may be zero when distance travelled by it is not zero. Reason: The displacement is the shortest distancebetween initial and final position Option. A Option. B Option. C Option. D
Answers
Answer:
A car accelerates uniformly from 30 km/h to 60 km/h in 5 seconds Calculate ::
(i) Acceleration in m/s²?
(ii) Distance covered by the car in metres during this interval?
Answer:
(i) Acceleration of car in m/s² is 1.66 m/s².
(ii) Distance covered by the car in metres during this interval is 62.4 meters.
Explanation:
Given that:
Initial velocity (u) = 30 km/h = (30 × 5/18) m/s = 8.33 m/s
Final velocity (v) = 60 km/h = (60 × 5/18) m/s = 16.66 m/s
Tine taken (t) = 5 seconds
To Find:
Acceleration (a)?
Distance covered (s)?
Solution:
Using first equation of motion ::
We know that,
⋆ \boxed{\bf{v = u + at}}
v=u+at
According to the question by using the formula we get,
➻ \sf 16.66 = 8.33 + (a\:\times\:5)16.66=8.33+(a×5)
➻ \sf 16.66 - 8.33 = 5a16.66−8.33=5a
➻ \sf 5a = 8.335a=8.33
➻ \sf a = {\cancel{\dfrac{8.33}{5}}}a=
5
8.33
➻ \bf\red{a = 1.66\:m/s^2}a=1.66m/s
2
∴ Hence, acceleration of car in m/s² is 1.66 m/s².
Now, let's find distance covered by the car. Using second equation of motion ::
We know that,
⋆ \boxed{\bf{s = ut + \dfrac{1}{2}at^2}}
s=ut+
2
1
at
2
According to the question by using the formula we get,
➻ \sf s = (8.33\:\times\:5) + \dfrac{1}{\cancel{2}}\:\times\:\cancel{1.66}\:\times\:(5)^2s=(8.33×5)+
2
1
×
1.66
×(5)
2
➻ \sf s = 41.65 + (0.83\:\times\:35)s=41.65+(0.83×35)
➻ \sf s = 41.65 + 20.75s=41.65+20.75
➻ \bf\purple{s = 62.4\:m}s=62.4m
∴ Distance covered by the car in metres during this interval is 62.4 meters.
Know More:
\clubsuit♣ Three equations of motion ::
v = u + atㅤㅤ ㅤ ㅤ [Used above]
s = ut + ½ at²ㅤㅤㅤ[Used above]
v² = u² + 2as
\clubsuit♣ Some important definitions ::
Acceleration
Acceleration is the process where velocity changes. Since, velocity is the speed and it has some direction. So, change in velocity is considered as acceleration.
Initial velocity
Initial velocity is the velocity of the object before the effect of acceleration.
Final velocity
After the effect of acceleration, velocity of the object changes. The new velocity gained by the object is known as final velocity.
Answer:
please write this question in short form I can't understand