InterviewSolution
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InterviewSolution
This section includes InterviewSolutions, each offering curated multiple-choice questions to sharpen your knowledge and support exam preparation. Choose a topic below to get started.
| 301. |
An apple is falling from a tree. The forces acting on it A) drag B) gravitational C) normal D) above all |
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Answer» D) above all option B is correct Gravitational
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| 302. |
A fruit is falling from a tree. Which force acts on the fruit? |
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Answer» Gravitational force acts on the fruit, which is from a tree. |
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| 303. |
Two persons are applying forces on two opposite sides of a moving cart. The cart still moves with the same speed in the same direction. What do you infer about the magnitudes and direction of the forces applied. |
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Answer» Both the forces are of equal magnitudes and applied in the opposite directions. |
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| 304. |
Fruits detached from a tree fall down due to force of gravity. We know that a force arises due to interaction between two objects. Name the objects interacting in this case. |
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Answer» Earth and fruits. |
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| 305. |
A book on a table is in rest. Then the magnitude of the given force is zero. A) Normal B) Frictional C) Gravitational D) None |
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Answer» Correct option is B) Frictional |
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| 306. |
How can you feel a force of 1 N? |
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Answer» It means that we have to exert a force of 9.8 N to hold a mass of 1 kg on our palm. |
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| 307. |
What is Equilibrium? |
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Answer» Equilibrium: A state in which opposing forces are balanced. |
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| 308. |
Find the net force from the following diagrams. |
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Answer» a) Net force = + 12N + 10N – 8N = + 22N – 8N = 14 N b) Net force = +9N – 8N = 1N |
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| 309. |
Like poles of ………… magnet each other. A) attract B) repelC) both D) none of these |
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Answer» Correct option is B) repel option b is correct re pel
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| 310. |
Two thermocol balls held close to each other move away from each other. When they are released, name the force which might be responsible for this phenomenon. Explain. |
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Answer» Electrostatic force. The balls have similar charges. They move away due to repulsion between similar charges. |
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| 311. |
What is magnitude? |
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Answer» Magnitude: The size of a quantity is called magnitude. |
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| 312. |
Unlike poles of ………… magnet each other. A) attract B) repel C) both D) none of these |
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Answer» Correct option is A) attract |
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| 313. |
What is the magnetic force? |
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Answer» The force exerted by a magnet on another magnet is called magnetic force. The magnetic force also acts on magnetic material such as iron, nickel. |
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| 314. |
What is net force? |
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Answer» Net force: The algebraic sum of all the forces acting on a body is known as the net force. |
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| 315. |
Define Magnetic force. |
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Answer» Magnetic force: The force exerted by o magnet on another magnet is called magnetic force. |
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| 316. |
The body moves with A) 20 N; → B) 60 N; →C) 20 N; ← D) 60 N; ← |
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Answer» Correct option is A) 20 N; → |
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| 317. |
A body of mass 1.5 kg is dropped from a height of 12m. What is the force acting on it during its fall? (g = 9.8 m s-2) |
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Answer» Mass of body = 1.5 kg Acceleration due to gravity = 9.8 ms-2 Force = mass (m) x acceleration due to gravity (g) = m g F = 1.50 × 9.8 = 14.7 N |
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| 318. |
Electrostatic force. |
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Answer» Electrostatic force: The force exerted by a charged body on another charged or uncharged body is known as electrostatic force. |
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| 319. |
What do you about electrostatic force? |
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Answer» The force exerted by a charged body on another charged or uncharged body is known as electrostatic force. |
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| 320. |
Distinguish between :Force of friction and Electrostatic force. |
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Answer»
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| 321. |
Complete the following:(a) Force = mass x ……..(b) 1 N = ……… dyne(c) 1 N = ………… kgf (approx.)(d) newton is the unit of ………. |
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Answer» (a) Force = mass x Acceleration (b) 1 N = 105 dyne (c) 1 N = 0.1 kgf (approx.) (d) Newton is the unit of Force. |
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| 322. |
A body of mass 1 kg is thrown vertically up with an initial speed of 5 m s-1. What is the magnitude and direction of force due to gravity acting on the body when it is at its highest point? Take G = 9.8 n kg-1 |
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Answer» Mass of body= 1 kg Initial speed = 5 m/s Acceleration due to gravity = 9.8 N/kg (vertically downwards) Force= mass x acceleration =1 × 9.8 = 9.8N = 1 kgf 9.8 N or 1 kgf force acts vertically downwards. |
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| 323. |
which of the following is not the force at a distance:(a) electrostatic force(b) gravitational force(c) frictional force(d) magnetic force. |
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Answer» Frictional force Hint: It is the force which comes in play when two bodies come in contact. |
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| 324. |
The part ‘a’ is A) S B) N C) P D) G |
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Answer» Correct option is B) N |
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| 325. |
Newton’s second law of motion applicable in all conditions is:(a) F = Δp/Δt(b) F = ma(c) F = M(ΔV/Δt)(d) all three |
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Answer» Newton’s second law of motion applicable in all conditions is- F = Δp/Δt |
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| 326. |
The direction of force can be represented by A) → B) ←C) ↑ D) Any one of the above |
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Answer» D) Any one of the above |
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| 327. |
Pressure varies with force (F) as (provided area is same) A) F B) \(\cfrac{1}F\)C) F2 D) \(\cfrac{1}{F^2}\) |
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Answer» Correct option is A) F |
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| 328. |
Normal force is applicable only when the given force is exist. A) gravitational B) frictional C) both A and BD) none |
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Answer» A) gravitational option C) both a and b
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| 329. |
Pressure can be increased by A) Increasing both the area and the force. B) Decreasing the area and increasing the force. C) Increasing the area and decreasing the force. D) Decreasing both the area and the force. |
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Answer» B) Decreasing the area and increasing the force. |
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| 330. |
Which of the following is wrong? A) Force can change the direction of an object B) Force can change the shape of an object C) Force can change the speed of an object D) Force can change the mass of an object |
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Answer» D) Force can change the mass of an object |
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| 331. |
Which of the following statements is correct about a force? A) It can be seen but it can’t be felt. B) It is needed to start an object moving. C) It can change the shape of an object. D) It can make moving object stop. |
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Answer» A) It can be seen but it can’t be felt. |
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| 332. |
Net force is zero, when an object is in A) uniform motion B) rest C) A and B D) uniform acceleration |
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Answer» Correct option is C) A and B |
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| 333. |
The force that a solid surface exerts on any object in the normal direction is calledA) Muscular force B) Normal Force C) Tension force D) Magnetic force |
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Answer» B) Normal Force |
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| 334. |
When the object is in non-uniform motion, it is said to be in A) displacement B) momentum C) acceleration D) weight |
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Answer» Correct option is C) acceleration |
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| 335. |
Give three examples of force exerted by muscles in our body. |
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Answer» 1. Blood circulation in our body. 2. Inhalation and exhalation of air by lungs. 3. Running by muscles of legs. |
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| 336. |
The forces exerted by a charged body on another charged or uncharged body is known asA) Electrostatic force B) Friction C) Tension D) Normal force |
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Answer» A) Electrostatic force |
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| 337. |
………… force acts on the suspended body along the string. A) Friction B) Tension C) Magnetic force D) Muscular force |
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Answer» Correct option is B) Tension |
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| 338. |
The unit of pressure in S.I. system is A) NewtonB) Pascal C) Ampere D) Henry |
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Answer» Correct option is B) Pascal |
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| 339. |
The resisting force to movement of an object is called A) friction B) magnetic forceC) tension D) normal force |
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Answer» Correct option is A) friction |
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| 340. |
The unit of force in S.I. system is i) Kg ms-2 ii) Newton iii) Pascaliv) Kg ms-1 A) Both i and ii B) iii and iv C) i and iii D) i and iv |
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Answer» A) Both i and ii |
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| 341. |
The force acting on unit area of a surface is called A) momentum B) density C) pressureD) velocity |
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Answer» Correct option is C) pressure |
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| 342. |
A force can change ……… of a body. A) shape B) direction C) speed D) all the above |
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Answer» D) all the above |
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| 343. |
Pressure exerted by a sharp needle on a surface is A) More than the pressure exerted by a blunt needle. B) Less than the pressure exerted by a blunt needle. C) Equal to the pressure exerted by a blunt needle. D) None of these. |
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Answer» A) More than the pressure exerted by a blunt needle. |
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| 344. |
Fig 1.37 shows a uniform metre rule placed on a fulcrum at its mid-point O and having a weight 40 gf at the 10 cm mark and a weight of 20 gf at the 90 cm mark.(i) Is the metre rule in equilibrium? If not, how will the rule turn?(ii) How can the rule be brought in equilibrium by using an additional weight of 40 gf? |
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Answer» (i) Anticlockwise moment = 40 gf × (50 − 10) cm =40gf × 40cm = 1600 gf × cm Clockwise moment = 20gf × (90- 50) = 20 gf × 40cm =800 gf × cm Anticlockwise moment is not equal to clockwise moment. Hence the metre rule is not in equilibrium and it will turn anticlockwise. (ii) To balance it, 40gf weight should be kept on right hand side so as to produce a clockwise moment about the middle point. Let its distance from the middle be d cm. Then, clockwise moment = 20 gf × 40cm + 40gf × d cm From the principle of moments, Anticlockwise moment= Clockwise moment 40 gf × 40 cm = 20gf × 40 + 40 × d cm 1600 – 800 = 40gf × dcm So, d = 800gf cm/40gf = 20 (on the other side) Hence, by placing the additional weight of 40 gf at the 70 cm mark the rule can be brought in equilibrium. |
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| 345. |
When a boy weighing 20 kgf sits at one end of a 4 m long see saw, it gets depressed at this end. How can it be brought to the horizontal position by a man weighing 40 kgf. |
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Answer» From the principle of moments, Anticlockwise moment = Clockwise moment 20 kgf × 2m = 40kgf × d So, d = 20kgf x 2m/40kgf = 1m from the centre on the side opposite to the boy. |
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| 346. |
A physical balance has its arms of length 60 cm and 40 cm. what weight kept on pan of longer arm will balance an object of weight 100 gf kept on other pan? |
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Answer» From the principle of moments, Anticlockwise moment = Clockwise moment 100 gf × 40 cm = W × 60 cm So, weight on the longer pan , W = 100gf x 40cm/60 = 200gf/3 = 66.67 gf |
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| 347. |
Bubbles rising from the bottom of the water filled in a bottle are depicted in the figure. Which is the correct figure? Justify your answer. |
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Answer» Fig. c. There will be more pressure in the lower side of the liquid. The pressure decreases when it comes upward. |
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| 348. |
Before hanging the wet clothes over laundry line, usually many jerks are given to the clothes to get them dried quickly. Why? |
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Answer» Before hanging the wet clothes over laundry line, usually many jerks are given to the clothes to get them dried quickly. Because of jerks, droplets of water from the pores of the cloth falls on the ground and reduced amount of water in clothes dries them quickly. This happens because when suddenly clothes are made in motion by giving jerks, the water droplets in it have the tendency to remain in rest and they are separated from clothes and fall on the ground. |
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| 349. |
Knife is made with A) Less surface area B) More surface areaC) Less surface area of contact D) More surface area of contact |
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Answer» C) Less surface area of contact |
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| 350. |
A force `F=(6hati-8hatj+10hatk)`N produces acceleration of `sqrt(2) ms^(-2)` in a body. Calculate the mass of the body.A. 10 kgB. 8 kgC. 12 kgD. 9 kg |
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Answer» Correct Answer - A `F=ma` or `m=(|F|)/(|a|)=(|6 hat(i)-8hat(j)+10 hat(k)|)/sqrt(2)` `=sqrt(6^(2)+8^(2)+10^(2))/sqrt(2)=10 kg` |
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