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This section includes 7 InterviewSolutions, each offering curated multiple-choice questions to sharpen your Current Affairs knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
When a shot is fired from a gun, the gun gets recoiled. Explain. |
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Answer» According to Newton's Third Law Of Motion :- " Every action FORCE has an EQUAL & OPPOSITE reaction force which acts SIMULTANEOUSLY " ! _______________________________________________ According to the statement when gun recoils ; An action force is exerted & opposite reaction force is exerted when it is recoiled ! Hence ; it agrees with the statement ! |
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| 2. |
What is Power drive expression for power |
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Answer» Answer: work/TIME Explanation: power is the ratio of total work DONE to the time taken |
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| 3. |
A=10N, B=15N, theta=60°. find |A+B| and |A-B| |
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Answer» Answer: 35 Explanation: ….…...….…...................................... |
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| 4. |
A car starting from rest , accelerated with 5m/s square for some time and then decelerate to come to rest with 3m/s square . Find the maximum velocity and distance cover by the body |
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Answer» s=ut+1/2at^2 u=20m/s v=5m/s a=-8m/s v=u+at 5=20+(-8)t -15=-8t t=1.875 sec Hope this HELPS.... |
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| 5. |
What is the shortest time interval measured indirectly so far |
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Answer» Answer: Hey mate your answer is displacement please mark as brainlist |
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| 6. |
14. Three capacitors are connectedtriangle as shown in the figure. Theequivalent capacitance between thepoints A and C is |
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Answer» Figure is not given, but will try to solve |
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| 7. |
11. Two points A and B are maintained ata potential of 7 Vand -4 V respectively.The work done in moving 50 electronsfrom A to B is |
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Answer» DV=W/q |
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| 8. |
Rakesh swims in a 90meter long pool he covers 180meter in one minute by swimming end to and along the same straight path find his average speed and average velocity |
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Answer» Answer: 3 m/s Explanation: |
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| 9. |
A girl swims in a pool back and forth and cover 240 m in 2 min. The pool is 60 m long . Find her average speed and average velocity |
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| 10. |
Give two reasons why different electrical appliances in a domestic circuit are connected in parallel |
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Answer» Explanation: They are CONNECTED in parallel because.. 1. As in parallel voltage remains the same and the CURRENT divides so each device can GET 220v and the current REQUIRED by TH to work. 2. If one device is not working or is damaged then it will not affect the working of the others. |
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| 11. |
Give three equation of motion which describe velocity time relation and positive time relation |
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Answer» Explanation: The THREE equations of motion are 1) v=u+at 2)s=ut+1/2at^2 3)v^2 =u^2 +2as where v is final velocity, u is initial velocity, a is ACCELERATION, s is the displacement and t is the time TAKEN (1) describes velocity - time relation (2) describes position - time relation |
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| 12. |
Give reason solids have negligible compressibility yet shape can be compressed |
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Answer» Answer: no it is not CHANGED her shape because it has many different PROPERTIES of LIQUID and GASES |
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| 13. |
Give examples of situation in which applied force can change in shape of an object and tabular form |
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Answer» Answer: When we PRESS the foam, its shape is changed. when we stretch the RUBBER BAND, its shape is changed. Hope this HELPS you. |
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| 14. |
Give reason why the electrical conductance of an electrolyte is less than that of metals. |
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Answer» Answer: The conductivity of an ELECTROLYTE is very LOW as compared to a metal at ROOM temperature because the number density of free ions in an electrolyte is much smaller as compared to number of free electrons in metals. Further, ions drift SLOWLY due to their heavier mass. Explanation: PLZ mark as brainliest |
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| 15. |
Give reason we see a tree on a road is stationary but when we are in the moving train we see that trees are moving fast in the direction opposite to the train of the train |
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Answer» Answer: |
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| 16. |
Give an example where the speed of an object first increases |
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Answer» KICK a football mark as BRAINLIEST |
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| 17. |
a car accelerated from 10 kilometre per hour to 40 kilometre per hour into minutes how much distance does it cover in this period (assume that the path is straight) |
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Answer» Initial VELOCITY of car (u) = 10km/hr final velocity of car(V) = 40 km/hr Time taken(t) = 1minutes = 1/60hr Acceleration of the car(a) = v - u t = 40 -10 1/60 = 30 × 60 = 1800km/hr² Now, using Equation v² = u²+2as (40)²= (10)²+2×1800×s 1600-100 = 3600s 1500 = 3600s s = 1500 = 5/12km 3600 |
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| 18. |
How will the equations of motion for an object moving with a uniform velocity change? |
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Answer» Vf=vi+at |
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| 19. |
An 8 ohm resistance wire is doubled on it. Calculate the new resistance of the wire |
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Answer» R is DIRECTLY PROPORTIONAL to l R1/R2=l1/l2 8/R2=2l/l therefore R2 be 4ohms |
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| 20. |
Give three differences between speed and velocity |
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Answer» Answer: 1. no direction 2. scalar quantity 3. only MAGNITUDE is their 4. speed = distance/time velocity 1. has direction 2. vector quantity 3. have magnitude and direction both 4. v = u +at |
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| 21. |
6. The total electric flux for the followingclosed surface which is kept insidewater |
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| 22. |
51 g Kerosene oil is found to weight 6.60kg. Find the density of kerosene oil in CGS unit. |
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Answer» Explanation: VOLUME= 51 L= 51 dm^3= 0.051 m^3 = 5100cc weight= 6.60kg= 6600g density of kerosine oil = 6600/5100 = 66/51= 1.29 g/cm^3 |
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| 23. |
What is Frictional Force |
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Answer» Answer: Frictional force refers to the force GENERATED by TWO SURFACES that CONTACT and slide against each other. It is static force.example, the friction between the ROAD and the tyre.. |
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| 24. |
Difference between displacement speed and distance |
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Answer» Answer: displacement and speed displacement is the VECTOR quantity because there is both speed is a SCALAR quantity displacement is the shortest distance between two points |
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| 25. |
Find the heat required to convert Ice at 0%to water v at 100°C mass=s0gm Find totalheat ? |
Answer» SORRY BABES I don't KNOW |
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| 26. |
Ravi, Rajiv and Shyam have body temperatures 35.8 degree Celsius, 36.2 degree Celsius and 36.4 degree Celsius respectively. The room temperature of the air is 36.1 degree Celsius. Who amongst them will feel cold? Give reason. |
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Answer» Rajiv and Shyam will feel cold. Explanation: This is because Rajiv's body temperature (36.2°C) and Shyam's body temperature (36.4°C) is more than the room temperature (36.4°C). Heat is a form of energy which always FLOWS from a body at a higher temperature to a body at a lower temperature. So their body heat will AUTOMATICALLY flow to the surrounding AIR by RADIATION and they will slowly start losing heat until the two temperatures become equal. So, they will feel cold. |
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| 27. |
The pressure= 15N /cm square, the area = 5 cm square, find the force |
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Answer» Answer: 75 N Explanation: pressure=force/area 15N=f/5 f=15N*5 f=75N |
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| 28. |
an object experiences a net non zero force is it possible for the object to move with a constant speed along a straight line |
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Answer» Explanation: hey MATE here's your answer... force is mass × acceleration which implies force depends upon acceleration. Acceleration occur when their is change in velocity but as velocity (SPEED) CONSTANT. Hence acceleration zero i.e. force zero. So, body will MOVE in straight line. |
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| 29. |
02. What should be the position of the object infront of concave mirror oi so that theimage and the object have the same size?ef reflection in the piven Toare |
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Answer» Answer: EXPLANATION:the object would be PLACED at the center of concave MIRROR to get the same SIZE of image |
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| 30. |
400 m track & field with computations....... |
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Answer» i दोन't no इam ध्ज्ग्फ़्ग्क्ज्ग्त |
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| 31. |
Ghdhkkgggukhsssfvvnklhfssgkk |
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Answer» EXPLANATION:jxhwrjv9so4n he OHIO KE i RHE tjcjxjxxjdns |
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| 32. |
Explain why thermoplastic become soft on heating but thermosetting plastic not become soft on heating |
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Answer» Answer: Explanation: Answer: Thermoplastics can be softened by heat but thermosetting plastics cannot be softened by heat. This is due to the DIFFERENCE in their structure. ... Due to this, on heating, the individual polymer chains can slide over ONE ANOTHER and thermoplastic material becomes SOFT and ultimately melts.
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| 33. |
Explain what is short circuiting and overloading in an electric circut |
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Answer» when a high power devices such as freeze,ac,ELECTRIC heater etc are connected to a SINGLE SOCKET is led to overloading. short circuit is a burning of WIRE or socket due to overloading. sometimes it also changes into blast. |
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| 34. |
Explain the working of simple vcr system with schematic, p-h, t-s diagrams |
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Answer» Answer: Explanation: The Standard Vapour compression Refrigeration System (Section 10.4). 3. ... class of vapour cycles, wherein the WORKING FLUID (REFRIGERANT) undergoes ... (a) and (b) show the schematic of a CARNOT vapour compression refrigeration system and .... This can be EXPLAINED very easily with the help of the T-s diagram ( |
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| 35. |
Explain spherical aberration in aberrations by tutorialspoint |
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| 36. |
Explain carnot's cyclecin chemistry and derive an expression for efficiency of carnot engine |
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Answer» The Carnot Efficiency is the theoretical MAXIMUM efficiency ONE can get when the heat engine is operating between two TEMPERATURES: The temperature at which the high temperature reservoir operates ( THot ). The temperature at which the low temperature reservoir operates ( TCold ). |
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| 37. |
2 examples from everyday life which shows that air exerts pressure |
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| 38. |
Show two uses of distance - time graphonly words 10 points |
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Answer» it tell us POSITION of BODY at any INSTANT of time and it give us velocity of body at any instant of time |
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| 39. |
CUPIECE8. A car starts from rest in 25 second its velocity becomes 150 km h . If the acceleration of the car isuniform then the acceleration be:(a) 10 ms? (0) 8 ms? (c) 6 ms (d) 4 ms |
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Answer» Explanation: I think you should have WRITE 150 m/s. Velocity =>150 m/s =V Time taken =>25 s= T Initial Velocity=> 0= U V =U+AT =>150=0+A(25)=>A= 150/25 m/s => 6 m/s. Correct option is (c).Hope it HELPS you.
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| 40. |
I Calculate acceleration of a body which starts fromand travel a distance of 87.5 m 5 sec.rest |
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Answer» Answer: 3.5m/s^2 hope it HELPS you |
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| 41. |
Answer the question Given in image |
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Answer» Copper and plastic material is BEST for MAKING connecting wire |
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| 42. |
Why is the weight of the object more at poles than the equator |
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Answer» Answer: POLES are higher in height than EQUATOR from the center of the earth. So g will act more than at the equator. Hence due to the Altitude DIFFERENCE Weight of the object is more at the poles than equator as the VALUE of g increases with altitude |
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| 43. |
if a bus travelling at 20m /s is subjected to steady deceleration of 5m/s square how long will it take to come to rest |
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Answer» Answer: Initial velocity with which the bus is moving = u= 20m/s. Final velocity which it has to GAIN = v= 0m/s. Deceleration = 5 m/s^2. Applying, v = u - at => 0 = 20 - 5 ×t => 5t = 20 => t= 4s. |
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| 44. |
The efficiency of the modern solar cells from Selenium is up to ......... |
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Answer» the EFFICIENCY is UPTO 25 % |
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| 45. |
Write down the number of significant figures in the following: (i) 3286 N (ii) 7100 kg (iii) 64.000 m (iv) 0.04192 Nm-1. |
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Answer» Answer:1) 4 2)4 3)5 4)4 Explanation: |
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| 46. |
Why a person should all the rifle shoulders before firing |
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Answer» Answer: A person should KEEP rifle just below the SHOULDER as it helps in absorption of SHOCK DUE to recoil of the gun at the time of firing. |
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| 47. |
Write an activity to show that liquid exerts pressure pressure in the base of the container |
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Answer» This can be DONE using any container or something like empty bottle of fevicol.... Make 3 holes in the bottle STARTING from its bottom. One near the bottom then a LITTLE upwards n then again above the previously made hole. Now HOLD those holes and insert water. After it is filled with water release ur hand. You will notice that water comes out with DECREASING pressure from bottom to top. So liquids exert pressure on the base of the container(here bottle) |
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| 48. |
In the adjoining diagram, R1= 10ohm, R2=20ohm R3=40ohm, R4=80ohm and Va=5V, Vb=10V, Vc=20V, Vd=15V. The current in the resistance R1 will be___. |
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Answer»
✌✌✌✌✌✌✌ Ur SOLUTIONS above |
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| 49. |
write the numerical ratio of displacement to distance when object is travelling in the same direction along straight line |
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Answer» Answer: When Object is travelling in ALONG a STRAIGHT line,the displacement and DISTANCE from starting POINT are same,So the RATIO is 1 |
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| 50. |
Show that the electric at the surface of a charged conductor is given by E = σ/ε0n cap , where where σis the surface charge density and n cap is a unit vector normal to the surface in the outward direction. |
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Answer» Answer: Explanation: According to GAUSS's theorem,
Here, q is the charge of the conductor. Now, σ=q/ds q=σds Hence, E.dscosθ = σds/ε As the unit VECTOR is NORMAL to to the surface in the upward direction. Thus, the angle between the electric FIELD and area vector is 0. E.ds = σds/ε E=σ/ε Along the vector- E=(σ/ε)N cap |
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