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Physics [1 Mark Question Answer]

Force, Work, Power and Energy · ICSE STD 10 (ICSE - English Medium). 101 questions.

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[1 Mark Question Answer]

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Question 11 Mark
A force is applied on a body of mass $20 kg$ moving with a velocity of $40 ms^{-1}$. The body attains a velocity of $50 ms^{-1}$ in 2 seconds. Calculate the work done by the body.
Answer
Work done, $W=\frac{1}{2} m\left(v_2{ }^2-v_1{ }^2\right)$
$=\frac{1}{2} \times 20\left(50^2-40^2\right)$
= 9000 J
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Question 21 Mark
Calculate the work done when:
A car is moved on a rough road through 30 m against a frictional resistance of 75 N.
Answer
Resisting force = 75 N; Distance moved = 30 m
∴ Work done = 75 × 30 J = 2250 J.
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Question 31 Mark
Calculate the work done when:
$A 5 \ kg$ weight is lifted 10 m vertically. $\left( g =9.8 m / s ^2\right)$
Answer
Force = m × g = 5 × 9.8 = 49 N; Distance = 10 m
∴ Work done = F × d = 49 × 10 = 490 J.
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Question 41 Mark
State the principle of conservation of energy.
Answer
It states that energy can neither be created nor be destroyed but can be transferred from one form to another form.
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Question 51 Mark
What is wind energy?
Answer
The kinetic energy of the moving large masses of air is called the wind energy.
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Question 61 Mark
How much hydro-electric power is generated in India?
Answer
At present, 23% of the total electricity is generated in India using hydro-energy.
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Question 71 Mark
What is hydro energy?
Answer
The kinetic energy possessed by the flowing water is called the water or hydro energy.
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Question 81 Mark
Name the material commonly used for the manufacturing of solar cells.
Answer
Silicon and Gallium. Solar cell produces d.c. current. State whether a solar cell produces a.c. or d.c. current.
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Question 91 Mark
Name the two groups in which various sources of energy are classified?
Answer
Renewable and Non-renewable sources of energy.
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Question 101 Mark
What is the main energy transformation that occur in:
Charging of a battery.
Answer
Electric energy to chemical energy.
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Question 111 Mark
What is the main energy transformation that occur in:
Photosynthesis in green leaves.
Answer
Light energy of chemical energy.
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Question 121 Mark
State the energy changes which take place in Electricity is obtained from solar energy.
Answer
Heat energy from the sun is converted into electricity.
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Question 131 Mark
Define contact forces.
Answer
The forces which are applied on a body through a connector, are called contact forces. Forces like Frictional force, Mechanical force, etc., are the forces of contact.
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Question 191 Mark
What kind of energy is possessed in a situation when?
A stone, in a stretched catapult.
Answer
Potential Energy.
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Question 211 Mark
What kind of energy is possessed in a situation when?
An electron spinning around the nucleus.
Answer
Kinetic Energy.
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Question 231 Mark
What kind of energy is possessed in a situation when?
A horse running along a level road
Answer
Kinetic Energy.
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Question 251 Mark
What kind of energy is possessed in a situation when?
A stone lying on the top of roof.
Answer
Potential Energy.
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Question 261 Mark
What kind of energy is possessed in a situation when?
A cocked up spring of air gun.
Answer
Potential Energy.
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Question 271 Mark
Is it possible that a body may possess energy even when it is not in motion?
Answer
Yes, the body may possess potential energy.
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Question 281 Mark
What do you understand by the kinetic energy of the body?
Answer
The kinetic energy of a body is the energy possessed by the body by virtue of its state of motion.
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Question 291 Mark
What do you understand by the potential energy of the body?
Answer
The potential energy of a body is the energy possessed by the body by virtue of its state or position.
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Question 301 Mark
What do you understand by mechanical energy?
Answer
The energy possessed by the body due to its state or its motion is called mechanical energy.
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Question 311 Mark
State the S.I. and C.G.S. units of energy. How are they related?
Answer
The S.I. unit of energy is the joule (J) and the $C.G.S$. unit is erg.
$1J = 10^7 erg.$
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Question 321 Mark
State the practical unit mainly used in mechanical engineering and write down its equivalent in watt.
Answer
The practical unit of power used in mechanical engineering is ‘Horse Power’ (H.P,)
1 H.P. = 746 W = 0.746 KW.
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Question 331 Mark
Which of the following remains constant in a uniform circular motion, Speed or Velocity, or both?
Answer
In a uniform circular motion, speed remains constant.
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Question 341 Mark
State $S.I.$ unit of power and define it.
Answer
$S.I.$ unit of power is $J / s$ or $Js ^{-1}$ (or watt W ). The power is said to be $1$ watt when $1 J$ of work is done in $1$ sec .
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Question 351 Mark
What is the work done by the moon when it revolves around the earth?
Answer
Work done $=$ Force $\times$ Displacement
0 work done as it is rotating around the earth with $\cos \theta 90$
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Question 361 Mark
When does a force do work?
Answer
A force does work whenever there is a displacement in the direction of force applied.
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Question 371 Mark
A force F when acts on a body, displace it by a distance d in a direction at an angle θ with the direction of the force. Write down the expression for the work done by the force.
Answer
Work done by the force, W = Fd cos θ.
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Question 381 Mark
Where is the centre of gravity of a uniform ring situated?
Answer
The centre of gravity of a uniform ring is situated at the centre of the ring.
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Question 391 Mark
State the condition when the work done by the force is negative.
Answer
Work done by a force is negative when the displacement is in the direction opposite to the force.
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Question 401 Mark
State the condition when the work done by the force is positive
Answer
Work done by a force is positive when the displacement is in the direction of the force.
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Question 421 Mark
In the following case write yes, if the work is being done and no if no work is being done.
A boy climbing up a staircase.
Answer
Yes.
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Question 431 Mark
In the following case write yes, if the work is being done and no if no work is being done.
A coolie standing with a heavy load on his head
Answer
No.
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Question 441 Mark
In the following case write yes, if the work is being done and no if no work is being done.
A man moving on the rough ground.
Answer
Yes.
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Question 451 Mark
In the following case write yes, if the work is being done and no if no work is being done.
A man trying to push a wall.
Answer
No.
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Question 461 Mark
Explain when we carry weight, on one hand, we bend on the other side.
Answer
This is to let our CG fall within the base of our support.
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Question 471 Mark
Explain why Standing passengers are not allowed on the upper deck of a double-decker bus.
Answer
The centre of gravity is raised and on an inclined road, the bus may topple.
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Question 481 Mark
Explain why a tight rope-walker, often holds a long pole in his hands when in action.
Answer
A tight rope-walker carries a long stick in his hand to maintain the CG such that the vertical line passes through the rope.
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Question 491 Mark
Define 1 kgf., How is it related to the S.I. unit of force?
Answer
It is the force due to gravity on a mass of 1kg. (kilogram), 1 kgf = 9.8 N.
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Question 501 Mark
With reference to the direction of action, how does a centripetal force differ from centrifugal force?
Answer
They act in opposite directions.
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[1 Mark Question Answer] - Physics STD 10 Questions - Vidyadip