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.
| 9801. |
The following diagram shows a three-pin Plug.To which line is the fuse connected. |
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Answer» The fuse is connected to the phase line. |
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| 9802. |
Energy is precious, especially electrical energy. Society must be convinced of the necessity of reducing the consumption of electrical energy. Prepare and propagate posters for this purpose. |
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| 9803. |
Which is the electric line to be connected to the point marked E in the diagram? |
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Answer» The pin marked E must be connected to the earth line. |
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| 9804. |
If the phase line comes into contact with the body of the appliance due to defects in the insulation, what happens to the person who touches the body of the appliance? |
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Answer» The person will get shock. |
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| 9805. |
In the figure, which are the lines that are connected to the coil of the electric iron? |
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Answer» Earth, Phase and Neutral lines. |
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| 9806. |
Write the main rules of the single game of Badminton? |
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Answer» Singles: All the above-mentioned rules shall be applicable to singles games but (i) the player serves from, and receives service in his respective right hand service court. When the player who serves is at 0 or there is an even number of points in the game, the service is always deliverd from the right hand service court. In case of odd numbers, the service is delivered from the left hand service court. (ii) Both the players change service courts after each has scored 1 point. (iii) The ladies single game consists of 11 points. When the score is 9-all, the player who first reaches 9 can set the game to 3 points. In case of the score is 10-all, the game is set to 2 points. |
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| 9807. |
Examine the given circuits and answer the questions.a. Identify series and parallel connection from the given circuits, b. Parallel mode of connected devices is advisable for household electrification? Why? |
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Answer» a. Figure A in series connection. Figure B in parallel connection. b. If the appliances are connected in parallel it will help to control each appliance with separate switches. It gives the needed voltage and current to appliances. |
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| 9808. |
A bulb of 60W in a classroom remains switched on for a long time from 9 am to 5 pm due to the negligence of students in the class.a. Calculate in joule the electric energy consumed by the bulb?b. If similar negligence had happened in 3 classrooms, how many units of electric energy would have been wasted?c. List out the different ways that can be adopted to save energy. |
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Answer» a. Energy consumed = 60 x 8 x 60 x 60 = 1,728,000 J = 1728 KJ b. Energy loss = \(\cfrac{60\times 8 \times 3}{1000}\) = 2.4 unit. c. i. Avoid unnecessary use of lights and bulbs. ii. Promote maximum use of natural light and wind. iii. Use energy-efficient electrical appliances. iv. Promote use of LED bulbs instead of filament lamps and CFL. |
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| 9809. |
What is the potential of the point where all the 3 phase lines are connected together? |
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Answer» Zero potential. |
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| 9810. |
Find the wrongly spelt word and write the correct spelling. i) driver; teacher; preacher; warrier ii) general; conquer; solder; history iii) batil; world; moment; defeat iv) careful; wonderful; beautiful; skilfull v) dependent; confident; resident; elephent vi) coward; capture; victory; proposel vii) prisoner; soldier; collecter; wonder viii) raise; praise; surpraise; paise ix) soldier; honour; haspital; music x) proposel; respect; great; people |
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Answer» i) warrior ii) soldier iii) battle iv) skilful v) elephant vi) proposal vii) collector viii) surprise ix) hospital x) proposal |
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| 9811. |
Describe the main Faults of the game of Badminton? |
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Answer» Faults: In case a fault is committed by a player of the playing side, the player who delivers the service shall be “out”. If the fault is committed by an opponent, the playing side gets one point. It shall be considered a fault: (a) When the struck or served shuttle is higher than the server’s waist or it is struck by the shaft of the racket higher than the server’s hand holding the racket. (b) When in serving, the shuttle falls into the wrong service court or falls short of the short service line or beyond the long service line or outside the side boundary line. (c) When serving, the player’s feet are not in the service court. (d) When before or during service any player intentionally obstructs his opponents. (e) When in service, the shuttle falls outside the boundary of the court, passes through under the net, fails to pass the net, or touches the person or dress of a player. (f) If the shuttle is struck before it crosses the striker side of the net. (g) When the shuttle is in play, a player touches the net or its supports with his body, racket or dress. (h) When the shuttle is held on the racket, a player strikes it twice in succession or it is struck twice in succession by the player first and then by his partner. (i) The opponent shall be reckoned as ready if in play he returns the shuttle or tries to hit it, whether he is in or outside the boundary. (j) When a player obstructs an opponent. |
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| 9812. |
Four 60W, 230V bulbs are connected between a phase and a neutral as shown in the diagram. (Line voltage is 230 V)a. How are the bulbs B, and B, are connected? What about B1 and B2? b. Which bulb will glow at 60W power? c. Which bulbs will glow with low power? Why? d. Which bulbs in the circuit can be controlled using separate switches. |
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Answer» a. B, and B, in series B and B in parallel. b. B, and B . c. B and B because each bulb gets less voltage as they are in series. So the bulb’s intensity will be less. d. B and B . |
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| 9813. |
What is the voltage of electricity supplied for domestic consumption?a. 400 Vb. 250Vc. 230Vd. 50V |
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Answer» Correct answer is: c. 230V |
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| 9814. |
What are different types of solder? |
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Answer» There are 3 different types of solders: 1. soft soldering- It originally used a tin-lead alloy as the filler metal 2. silver soldering- It uses an alloy containing silver 3. brazing -It uses a brass alloy for the filler |
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| 9815. |
Name the type of transformer. |
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Answer» The type of transformer is -Step-up transformer. |
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| 9816. |
a. Write down the names of parts numbered.b. State the working principle of this device. |
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Answer» a. 1. Field magnet, 2.Armature, 3. Slip rings. b. Generators convert mechanical energy into electrical energy. Flux is changed and current is produced in the coil when the armature rotates from an axis. So current is induced due to flux change. |
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| 9817. |
If voltage and current are known, what is the formula for finding power? |
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Answer» Power = Voltage x Current |
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| 9818. |
Give winding details of fractional horse power motor? |
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Answer» The term 'fractional' indicates that the motor often has a power rating smaller than one horsepower Winding Details: 1. The stator is a laminated magnetic core which holds electrical winding. Electricity flowing through these winding produces magnetic field. 2. Rotor is the part that runs and has no winding. 3. Bearing holds the rotating shaft. |
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| 9819. |
What is the basic principle of working of a transformer? |
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Answer» Mutual induction |
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| 9820. |
What are the occasions when current flows through the second coil? |
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Answer» When the switch in the first coil is kept on or off. |
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| 9821. |
Observe the graph and answer the following.a. In which angles are the rate of changes of flux is maximum?b. In which angles are the induced emf maximum? c. What is meant by period of AC? d. What is meant by frequency of AC? e. What is the aim of increasing number of magnetic pole and armature coil in a power generator? |
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Answer» a. 90° and 270° b. 90° and 270° c. The time taken by the armature coil for a full rotation is called Period. d. The number of cycles per second is the frequency of AC. e. To increase the amount of electricity produced. |
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| 9822. |
Turn on & turn off the switch continuously. What do you observe? |
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Answer» Bulb glows and then goes off. |
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| 9823. |
The input voltage of a transformer is 240V AC. There are 80 turns in the secondary coil and 800 turns in the primary. What is the output voltage of the transformer? |
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Answer» Vp = 240V Ns = 80 Np = 800 \(\cfrac{V_s}{V_p}\) = \(\cfrac{N_s}{N_p}\) \(V_s = \cfrac{N_s\times V_p}{N_p}\) = \(\cfrac{80 \times 240}{800}\) = 24 \(V\) |
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| 9824. |
Can you suggest a method by which change can be brought in magnetic flux without switching on and off continuously? |
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Answer» If AC is given to the primary coil instead of j DC, emf will be continuously induced in the secondary coil. |
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| 9825. |
A transformer working on a 240 V AC supplies a voltage of 8 V to an electric bell in the circuit. The number of turns in the primary coil is 4800. Calculate the number of turns in the secondary coil. |
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Answer» Vp = 240V Vs = 8V Np = 4800 \(\cfrac{V_s}{V_p}\) = \(\cfrac{N_s}{N_p}\) Ns = \(\cfrac{V_s\times N_s}{240}\) = 160 |
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| 9826. |
A transformer without power loss carries 4000 turns in the primary and 2000 turns in the secondary. If the primary voltage is 120 V and the current is 0.2 A.a. What is the output voltage of transformer?b. What is the current in the secondary?c. What is the maximum output power?d. Where are the thick wires to be used in this transformer in the primary or secondary? Why? |
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Answer» a. 60 V, \(\cfrac{Vs}{Vp}\) = \(\cfrac{Ns}{Np}\) Vs = \(\cfrac{Ns}{Np}\)\(\times\)Vp = \(\cfrac{2000}{4000}\) \(\times\)120 = 60 V b. 120 V \(\times\) 0.2 A = 60 V \(\times\) Is Is = 0.4 A c. P = VI = 60 \(\times\) 0.4 = 24 W d. In the secondary. Since P = V1 current is more in the secondary. |
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| 9827. |
In a transformer without any loss in power, there are 5000 turns in the primary and 250 turns in the secondary. The primary voltage is 120 V and the primary current is 0.1 A. Find the voltage and current in the secondary. |
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Answer» NP = 5000 NS = 250 VP = 120 IP = 0.1A \(\cfrac{V_s}{V_p} = \cfrac{N_s}{N_p}\) \(V_s\) = \(\cfrac{V_s}{V_p} \times V_p\) = \(\cfrac{250}{5000}\times 120 =6V\) \(\cfrac{V_s}{V_p} = \cfrac{I_p}{I_s}\) \(I_s = \cfrac{I_p}{V_s}\times V_p=\cfrac{0.1}{6}\times 120 =2A\) |
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| 9828. |
Examine the diagrams of step up and stepdown transformers and list out the differences in their designs. |
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| 9829. |
Categorize the following relations appropriately as step up or step down transformers.VS > VPVS < VPIS > IPIS < IP\(\cfrac{N_s}{N_p}<1\)\(\cfrac{N_s}{N_p}>1\) |
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| 9830. |
Different stages of power transmission and distribution are given in a flow chart.i. Choose the suitable terms from the bracket given below and arrange them in the given boxes in the correct order. (Power generator, substation, power transformer, star connection, distribution transformer, household connection, power grid)ii. What do you mean by power grid? Give two advantages of power grid. |
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Answer» i. a. Power generator. b. Power transformer. c. Substation. d. distribution transformer. e. Star connection. f. household connection. ii. Power grid is the network that connects different power generating center and distribution systems to one another. Due to this arrangement, if any defect occurs either at the generator or transmission lines, electricity can be taken from any other power generating center through another set of transmission lines. |
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| 9831. |
Name the solenoid which is used to control emf. |
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Answer» Inductor is the solenoid which is used to control emf. |
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| 9832. |
Observe the figure given below. (The figure indicates the two stages of doing the experiment)1. On which instance will the magnetic flux linked with the solenoid be less?2. On which instance will the magnetic flux linked with the solenoid be greater?3. On which instance does a change in magnetic flux linked with the solenoid occur? (while it is moving/ while it is stationary) |
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Answer» 1. Magnet is moved away from it solenoid. 2. When magnet is moved into the solenoid. 3. while it is moving. |
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| 9833. |
Identify the relation and fill up the blank.Step up transformer: power transformer Step down transformer: |
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Answer» Step down transformer: Distribution transformer. |
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| 9834. |
As a result of the flow of current through a solenoid, is there any chance of inducing an electric current in the same solenoid? |
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Answer» Yes. By self-induction. |
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| 9835. |
What happens to the voice coil then? |
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Answer» Voice coil - Vibrates |
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| 9836. |
What are the similarities between the DC motor that we saw in the previous chapter and a DC generator? |
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| 9837. |
What will be the result? |
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Answer» Creates electric signal corresponding to the sound. |
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| 9838. |
In connection with the working of a microphone, a few statements are given inboxes. Arrange them in the proper sequence. |
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Answer» Sound is produced → diaphragm vibrates → Voice coil vibrates → electrical signals are produced in the voice coil. |
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| 9839. |
What are desirable features of printers? |
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Answer» I. Print Speed. A print speed of at least 10 color pages per minute and 20 black-and-white pages per minute is a minimum standard to look for as a print speed specification. II. Printer Quality. III. Duty Cycle. IV. Ink Replacement Costs. V. Scanner Resolution. VI. Scanner Element Type. VII. OCR Scanner Software. |
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| 9840. |
Find out the similarities and differences between a moving coil microphone and a moving coil loudspeaker and write them down in the science diary. |
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Answer» Similarities:
Differences:
Electrical energy → sound energy.
Sound energy → Electrical energy. |
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| 9841. |
What is the energy transformation that takes place in a moving coil microphone? |
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Answer» Sound energy → Electrical energy. |
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| 9842. |
Which are the main parts of a moving coil microphone? |
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Answer» Diaphragm, Permanent magnet and Voice coil. |
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| 9843. |
What do you understand by biasing? Why crossover distortion happens if biasing is not done? |
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Answer» Biasing is a high frequency tone that is well above the range of human hearing and is mixed with the audio to line arige the signal recorded on tape. Biasing also has a significant effect on the high frequency response of the recording. Machines are biased according to the manufacturers specification. The chosen record level the machine is aligned to also influence the effect of the biasing and the bias calibration. Crossover distortion is a type of distortion which is caused by switching between devices driving a load. Without the bias severe crossover distortion would result. |
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| 9844. |
Describe the methods to check a cable for continuity. |
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Answer» There are two popular method of checking the continuity of a cable- Testing leads or cable using a cable tester- any repair or construction of leads require testing on completion to verify that they are in good working order. As well as electrically testing a lead a thorough visual inspection is also required. The easiest method to check a cable for continuity is using a cable tester. These are special devices that on identify loose connections incorrect connections, short circuits and open circuit conditions. Testing leads or cable using a multimeter another method to check a cable for continuity is using a multimeter. Properly operated a multimeter is more retiable way to check leads and can also provide an alternate method when there is doubt about integrity of the cable tester. Method- Plug the test leads of the multimeter into the meter and select the continuity test mode or low ohms mode. Bring the end of the test leads together to form a circuit and check that meter is working correctly. |
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| 9845. |
Check the continuity of the function f given by f(x) =2x+3 at x= 1 |
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Answer» The function is continuous at x=1 if lim x→1 f(x)=f(1) L.H.S=lim x→1 f(x) =lim x→1 (2x+3)=2×1+3=2+3=5 R.H.S=f(1)=2×1+3=2+3=5 Since L.H.S=R.H.S ∴ the function is continuous. |
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| 9846. |
Why ___ nothing ___? A) has / been done still B) hasn’t / been done yet C) has / been done yet D) was / done yet E) have / been done yet |
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Answer» Correct option is C) has / been done yet |
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| 9847. |
Choose the correct Antonyms for the italic word.1. Vetri was once a umbusinessman in Coimbatore. (a) powerful (b) unsuccessful (c) wonderful(d) awful2. Vetri found it difficult to establish his business. (a) abolish (b) setup (c) deal (d) offer3. He started to lead a normal life. (a) usual (b) same (c) ordinary(d) abnormal4. His brothers demanded to split the wealth. (a) offered (b) searched (c) rushed (d) ordered5. One day he discussed with his wife. (a) ignored (b) considered (c) examined (d) argued |
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Answer» 1. (a) lingered 2. (d) agreement 3. (c) unaffected 4. (b) gave 5. (c) nothing |
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| 9848. |
In a different planet, the acceleration due to gravity is `2m//s^(2)`. A particle is thrown horizontally at a speed of `3 m//s` from a height of `10 m`. The equation of trajectory of the particle comes out to be `x^(2)=alphay`. Find the value of `alpha` [Take `+X-`axis alonf the direction of projection and `+Y` axis towards the surface of planet.]A. `7`B. `8`C. `9`D. `10` |
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Answer» Correct Answer - C `x=3t` `y=t^(2)rArr x^(2)=9y`. |
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| 9849. |
A motor cyclist accelerate from rest with acceleration of `2 m//s^(2)` for a time of `10 sec`. Then he moves with a constant velocity for `20 sec` and then finally comes to rest with a deceleration of `1 m//s^(2)`. Average speed for complete journey is `:-`A. `10 m//s`B. `14 m//s`C. `20m//s`D. `28 m//s` |
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Answer» Correct Answer - B `V_(2v)=((1)/(2)2(10)^(2)+20xx20+(20)^(2)/(2xx1))/(10+20+20)` `=(100+400+200)/(50)=14 m//s` |
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| 9850. |
A particle moved along the `X-`axis according to the graph shown in Figure. Choose the incorrct options. A. The particle did not move in straight line from `t=0 s` to `t=5s`.B. The magnitude of displacement of particle from `t=0s` to `t=5s` is `2 m`.C. The average speed of particle from `t=0s` to `t=5s` is `0.8 m//s`D. The speed of particle is zero somewhere between `t=3s` to `t=4s`. |
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Answer» Correct Answer - A `(1)` since the particle is moving along `x-`axis it is straight line. `(2)` `s=x_(f)-x_(i)=2-0=2m` `(3)` distance `=(3-0)+(3-2)=4` `:.ltVgt.=(4)/(5)=0.8m//s` `(4)` Slope is zero between `t=3` & `4 sec` |
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