Saved Bookmarks
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. |
1. An object experiences a net zero external unbalanced force. Isit possible for the object to be travelling with a non-zero velocity?If yes, state the conditions that must be placed on themagnitude and direction of the velocity. If no, provide a reason |
|
Answer» Answer: When a net ZERO EXTERNAL unbalanced force is applied on the body, it is possible for the OBJECT to be travelling with a non-zero velocity. In fact, once an object COMES into motion and there is a condition in which its motion is unopposed by any external force; the object will continue to remain in motion. Explanation: please mark me as BRAINLIEST and follow me |
|
| 2. |
2. If a body is moving in circular path of radius 14 m.It complete one revolution in 7 s. Considering thespeed to be uniform, the value of centripetalacceleration is[NCERT Pg. 80](1) 9 r2 m/s2(2) T2 m/s278I ² m/s²(3)3.2 m/s2(4) -T4 |
|
Answer» Answer: 3.2 m/s2 is the CENTRIPETAL ACCELERATION . |
|
| 3. |
A body of weight W rests on a frictional surface . what is the angle between force of friction and normal reaction.solve it if ur answer is right then I mark u as brainlist. |
|
Answer» Angle of FRICTION, is the angle which the resultant of LIMITING friction and normal REACTION makes with the normal reaction. ∴tanθ= R F
or W F
=tanθ solution |
|
| 4. |
4. 3 resistors having equal resistance when combined in series having equivalentresistance 45ohm. The equivalent resistance when connected parallel-a. 15 ohmb. 5 ohmc. 90 ohmd. 30 ohm |
|
Answer» the CORRECT answer is 5 OHM the explanation is in or above photo hope it MAY help you |
|
| 5. |
64 drops each having thecapacity C and potential V arecombined to form a big drop. Ifthe charge on the small drop isq, then the charge on the bigdrop will beO a) 2qO. (b) 4qO (c) 16qO (d) 64q |
|
Answer» d . 64q Explanation: |
|
| 6. |
The area of cross section of wire becomes half when its length is stretched to double. How *resistivity* of wire is affected in new condition?(i know resistance,just tell me resistivity)class 10 .physics.chapter electricity. |
|
Answer» RESISTIVITY REMAINS same |
|
| 7. |
7.A lens of focal length 14cm forms an erect image,three times the size of theobject. The distancebetween the object andimage is: |
Answer» .................................................................... |
|
| 8. |
9. A uniform ladder of length 10 m rests against a smooth vertical wall.The lower end of the ladder is at a distance of 8 m from the wall. Howfar up a man weighting 60 kg can go up the ladder before it startsslipping. if the weight of the ladder is 40 kg and the coefficient offriction between ladder and ground is 0-4. |
|
Answer» I didn't UNDERSTAND this QUESTION |
|
| 9. |
5.A ray of light is travellingin a directionperpendicular to theboundary of a parallelglass slab. The ray of light: |
| Answer» | |
| 10. |
8. Calculate the followinga) Effective resistanceb) Total currentc) Potential difference across 7 ohm |
|
Answer» Answer: |
|
| 11. |
(d) til4. Two small spherical shells A and B are given positive charge of 9 C and 4 C respectively and placed suchthat their centres are separated by 10 m. If P is a point in between them where the electric field intensity iszero, then the distance of the point P from the centre of A is |
|
Answer» PLEASE MARK as BRAINLIEST |
|
| 12. |
A student connects a water heater to 5 ampere electric circuit. Is this current? Give suitable reason to your answer |
|
Answer» No, this is not correct. Because a WATER heater needs high ENERGY circuit with near about 240 volts and 25-30 Amp. So when the student will connect a water heater to a 5A electric circuit, a short circuit can be HAPPENED due to overload and it can break the circuit and damage the heater. |
|
| 13. |
(e) State two ways to increase the speed rotation of a D.C. motor.(i) By increasing the strength of current through the coil.(ii) By increasing the number of turns in the coil. |
|
Answer» Answer: Magnetic flux - By decreasing the flux, the speed of the motor can be increased. The flux can be CHANGED by changing the current with a shunt field rheostat. Resistance of the ARMATURE CIRCUIT - By decreasing the resistance, there is INCREASE in the armature current which causes a LARGER torque to be developed |
|
| 14. |
A) Give one example to show how the resistance depends on the nature of material of the conductor.of the conductor ?b) Calculate the resistance of an aluminium cable of length 10 km and diameter 2.0 mm if the resistivity ofaluminium is 2.7 x 10-8 S2m. |
|
Answer» Answer: 1 Answer. (a) If we take two similar wires of same length and same diameter, one of COPPER metal and other of nichrome alloy, we will find that the resistance of nichrome wire is about 60 times more than that of the copper wire. This shows that the resistance DEPENDS on the nature of material of the conductor. Explanation: Electricity is one of the forms of energy which involves the flow of electrons. It is a basic part of nature and the most COMMONLY used form of energy. The generation of electricity happens with the help of a device called an electric generator. When a current-carrying conductor moves across a magnetic field, an electric current generated in the conductor. A magnet is used at the end of the rotating shaft which is placed within a STATIONARY conducting ring which is a long and a continuous piece of wire. A small amount of electric current is induced through the conductor at different sections as the magnet keeps moving. All these small currents add up to one CONSIDERABLE amount of current which is known as electric power. |
|
| 15. |
A force exerted on a 3 m long conductor having a current of 2 A in 0-4 T magnetic inductionwith an angle of 30° is(1)1.2N(2)12N(3)72N(4)2.4N |
| Answer» | |
| 16. |
Assertion(A): The emergent ray is parallel to the direction of the incident ray.Reason (R): In a rectangular glass slabthe extent of bending of the ray of light at the opposite parallel faces of the rectangular slab is equal and opposite. |
|
Answer» Answer: Here, the light RAY bends away from the normal. We see that the incident and emergent RAYS are parallel to each other. These rays are parallel because the extent of BENDING on the opposite and parallel faces of slab is EQUAL and opposite |
|
| 17. |
The initial velocity of a particle is 10m/s. It is moving with an acceleration of 4m/s^2. The distance covered by the particle after 2 sec is:1. 6m 2.18m 3.22m 4.28m |
|
Answer» Answer: u=10m/s a=−2m/s 2
n=5 The DISTANCE covered by the PARTICLE in n th second is S n
=u+ 2 a
(2n−1) S 5
=10− 2 2
(2×5−1) S 5
=10−9=1m |
|
| 18. |
30. A rectangular plate is placed on a rough plank. Dimensions of the plank is as shown in the figure. Find theminimum acceleration with which the plank should be moved so that the rectangular plate topples (considerthe friction is sufficient so the plate does not slide). |
|
Answer» bsosbskbshdishisoqjw JO qhbd |
|
| 19. |
A clock shows 3 hr 5 min. When seen through a plane mirror, the time appears to be(1) 8 hr 55 min (2)13 hr 5 min (3) 9hr35min |
|
Answer» Answer: Good you are NICE person... Really the answer was given by me and you CHOOSE BRAINLIST him Not fair really..... |
|
| 20. |
Find the pressure exerted on6ft X 10ftwall by the atmosphere. If Atmospheric pressureIS A. I psi |
|
Answer» Answer: 60ft^2.......................... |
|
| 21. |
4. The equation of state for a real gas at highanRTtemperature is given by PwhereV-b 12V/V + b)n, PV&T are number of moles, pressure, volume &temperature respectively & R is the universal gasconstant. Findthe dimensions of constant 'a' in theabove equation.Sol. |
|
Answer» PV=nRT= M w
RT Hence, PM= V w
RT=ρRT ρ∝P Here, ρ= V w
N= M w
ρ is the density, P is the pressure, V is the volume, n is the number of MOLES, R is the ideal gas constant, T is the TEMPERATURE and M is the molar MASS |
|
| 22. |
80. What happens when Benzoic acid is treatedwith concentrated Nitric acid in the presenceof concentrated Sulphuric acid ?A) p-Nitro benzoic acid(B) - benzale acid(C) -Nitrobenzoic acid( None of these |
| Answer» | |
| 23. |
3. find thethe pressure exected on the ground (in psi) by a 250 Ib person who is sittig on a chair whose 4 legstouch the ground with and area of 1" by 2" eachwho Is sittingtouch the |
| Answer» | |
| 24. |
A point mass 1 kg moving with velocity 8 m/scollides elastically with stationary point mass of 5kg. After their collision, the 1 kg body reverses itsdirections and move with a speed of 2 m/s. Thevelocity of 5 kg body is |
| Answer» | |
| 25. |
एक आदर्श गैस, जिसका दाब P, आयतन V तथाताप T है, को रुद्धोष्मतः विस्तारित किया जाता हैकि उसका आयतन 4V हो जाता है और ताप गिरकरT/2 हो जाता है। गैस का रुद्धोष्म घातांक है:(A) 1.66(B) 1.50(C) 1.40(D) 1.33 |
| Answer» | |
| 26. |
The principle of rest and recovery holds that youneed to give your muscles time to rest and recoverafter a workout.TrueFalse |
| Answer» | |
| 27. |
Pick the four muscles that make up the Quadriceps(quads)Vastus intermediusVastus medialisVastus lateralisRectus femorisRectus abdominis |
|
Answer» the VASTUS lateralis, vastus medialis, vastus intermedius, and the RECTUS femoris. |
|
| 28. |
Astronomical unit (AU) is the average distancebetween the earth and sun, approximately 1.5 x 100 km.The speed of light is about 3.0 x 108 m/s. The speed oflight in astronomical unit per minute is |
Answer» Astronomical unit (AU) is the average distance between the earth and SUN, APPROXIMATELY 1.5 x 100 km. The SPEED of light is about 3.0 x 10 m/s. The speed of light in astronomical unit per MINUTE is (a) 0.012 AU/min (b) 0.12 AU/min (c) 1.2 AU/min (d) 12.0 AU/min (AMU (Med.)) |
|
| 29. |
Pick the three muscles that make up the CalvesGastrocnemiusSoleusTrapeziusPeroneus Longus |
|
Answer» Gastrocnemius and SOLEUS Explanation: PLEASE mark me as BRAINLIST |
|
| 30. |
. A person needs a lens pf of power -5.5D for correcting his distant vision. For correcting his nearvision, he needs a lens of power +1.5D. Calculate the focal length of the lenses used in these two cases. |
Answer» Given:-
To Find:-
Solution:-As we KNOW that Power of lens is defined as the reciprocal of its focal length → P = 1/fCALCULATING focal length of 1st lens → P₁ = 1/f₁ Substitute the VALUE we get → -5.5D = 1/f → -5.5 ×f = 1 → f₁ = 1/(-5.5) → f₁ = -0.18 m ∴ The focal length of 1st lens is 0.18m. Now Calculating focal length of 2nd lens → P₂ = 1/f₂ Substitute the value we get → 1.5 = 1/f₂ → 1.5×f₂ = 1 → f₂ = 1/1.5 → f₂ = 0.06 m ∴ The focal length of 2nd lens is 0.06 metre. |
|
| 31. |
Muscle contractionscan be isotonic or isometricTrueFalse |
|
Answer» Answer: True Explanation: Beacuse, A muscle contraction is isometric if muscle tension CHANGES, but muscle length REMAINS the same. and . It is isotonic if muscle length changes, but muscle tension remains the same. Hope it will help U Mark me as brainlist ✌☺ |
|
| 32. |
Muscle contractionscan be isotonic or isometric.Question 2 options:TrueFalse |
|
Answer» A is your CORRECT answer |
|
| 33. |
1 question- If the focal length of a lens is 12.6 cm find its power2 questionIf the focal length of a lens is 17.48 cm find its power |
|
Answer»
find power.... we know that , power = 1/f
so power p = 1/12.6 = 0.0793650794 hope it helps you guys |
|
| 34. |
Muscle hypertrophy refers to growth in the size ofmuscles and muscle fibersQuestion 1 options:TrueFalse |
|
Answer» The answer will be TRUE . PLEASE MARK me as the BRAINLIEST......✌ |
|
| 35. |
In which of the following the particles have highest of attraction? water, Nac1 (solid) ice and wax |
|
Answer» Explanation: NACL have the HIGHEST ATTRACTION force as it is a solid. Thank u |
|
| 36. |
KoogleTest Level-3 (Unit-6)A force of 0.01 N is exerted on a charge of 1.2 x 10-5 C. at a certain point. The electric field at that point isA) 5.3 x 106 N/CB) 8.3 x 106 N/CC) 5.3 x 106 N/CD) 8.3 x 102 N/C |
Answer» Here applyingFormula:where e is electric FIELD and f is force. f here is = 0.01N q = so, Hope this gonna help you ♡(∩o∩)♡ |
|
| 37. |
KoogleCorrectIncorrectUnattemptedSelf Assessment Test (Unit-6)The ratio of the forces between two small conducting spheres charged to constant potentials in (a) air (b) a medium of K= 2 isA) 1:4B) 2:1C) 1:2D) 4:1 |
Answer» Here you go♡(∩o∩)♡Hope this will HELP you (๑・ω-)～♥” |
|
| 38. |
PHYSICSCHAPTER 2A. Objective Questions 1. Write true or false for each statement(a) Equal volumes of the two different substances have equal masses.(b) The density of a piece of brass will change by changing its size or shape.(c) The density of a liquid decreases with increase in its temperature.(d) Relative density of water is 1.0.(e) Relative density of a substance is expressed in gm-3.(f) When a body is immersed in a liquid, the buoyant force experienced by the body is equal to the volume of the liquid displaced by it.(g) A body experiences the same buoyant force while floating in water or alcohol. A body experiences the same buoyant force when it floats or sinks in water.(h) A body floats in a liquid when its weight becomes equal to the weight of the liquid displaced by its submerged part(i) ) A body while floating, sinks deeper in a liquid of low density than in a liquid of high density.2. Fill in the blanks (a) 1kg is the mass of______ water at 4°C. (b) Mass = density × ______ (c) The S.I. unit of density is _____ (d) Density of water is ______ (e) 1 g cm-3 = ______(f) The density of a body which sinks in water is ____than 1000 Kg (g) A body sinks in a liquid A; but floats in a liquid. The density of liquid is ____than the density of liquid B (h) A body sinks in water, but a body Y floats on water. The density of the body is ____ than the density of the body. (i) The buoyant force experienced by a body when floating in salt-water is ______ to or same that of when floating in pure water. (j) The weight of a body floating in a liquid is _____3. . Select the correct alternative (a) The correct relation is 1. Density = Mass × Volume 2. Mass = Density × Volume 3. Volume = Density × Mass 4. Density = Mass + Volume (b) The relative density of alcohol is 0.8 its density is 1. 0.8 2. 800 kg 3 3. 800 g 34. 0.8 kg −3(c) A block of wood of density 0.8gcm-3 has a volume of 60cm3 . The mass of block is 1. 1. 60.8 g 2. 75 g 3. 48 g 4. 0.013 g(d) The density of aluminium is 2.7 g3 and that of brass 8.4 3 . The correct statement is 1. Equal masses of aluminium and brass have equal volumes 2. The mass of a certain volume of brass is more than the mass of equal volume of aluminium. 3. The volume of a certain mass of brass is more than the volume of equal mass of aluminium. 4. Equal volumes of aluminium and brass have equal masses.(e) A density bottle has a marking 25 mL on it. It means that: 1. the mass of density bottle is 25g 2. the density bottle will store 25 ml of any liquid in it 3. the density bottle will store 25 ml of water, but more volume of liquid denser than water. 4. the density bottle will store 25 ml of water, but more volume of a liquid lighter than water.(f) The correct statement is1. The buoyant force on a body is equal to the volume of the liquid displaced by it 2. The buoyant force on a body is equal to the volume of the body 3. The buoyant force on a body is equal to the weight of the liquid displaced by it 4. The buoyant force on a body is always equal to the weight of the body.(g) A piece of wood floats on water. The buoyant force on wood will be 1. zero 2. more than the weight of the wood piece 3. equal to the weight of the wood piece 4. less than the weight of the wood piece.(h) The weight of a body is more than the buoyant force experienced by it, due to a liquid. The body will 1. Sink 2. float with its some part outside the liquid 3. float just below the surface of liquid 4. Float with whole of its volume above the surface of liquid. |
|
Answer» true true false false true false |
|
| 39. |
. A spring loaded governor of Wilson-Hartnell type is shown in fig. Two balls each of mass 6kg are connected by two spring. A speed of the governor is 600 r.p.m. in its mean position. Theradius of the governor ball is 150 mm. The tension in each of the spring A is 1300 N. Find the tension in the spring B for this position. Find the necessary stiffness of the spring B if the speed is 630 r.p.m. when the sleeve moves up 20 mm from mean position and if stiffness of each spring A is 10kN/m |
|
Answer» Don't KNOW And it is not of my CLASS |
|
| 40. |
(i)Derive the following expression of effects of partial balancing in two cylinderlocomotive engine (i) Variation of attractive force (ii) Swaying couple (iii) Hammer blow(i)State the methods of force balancing of linkages by lowen and berk method. |
|
Answer» Q:State the METHODS of force balancing of linkages by lowen and berk method. =(ans in 1ST attachment) Q: Variation of attractive force = Attractive and repulsive forces between ATOMS: My understanding is that, as two hydrogen atoms approach, attraction is stronger INITIALLY but repulsion is stronger at shorter distances. Taking the simplistic view that protons and electrons are DISCRETE particles, it seems to me that, no matter how closely the atoms approach, there is a always a configuration in which the proton-electron distances can be smaller than the proton-proton and electron-electron distances. Given this, why should repulsion be stronger than attraction at short distances? |
|
| 41. |
A cantilever shaft 10 cm diameter and 100 cm long is fixed at one end and other endcarries a flywheel of mass 80 kg. The young’s modulus for the shaft material is 2 x 106kg/cm2. Determine the natural frequency of longitudinal and transverse vibration of the shaft? |
|
Answer» Explanation: TAKE as reference |
|
| 42. |
A cantilever shaft 10 cm diameter and 100 cm long is fixed at one end and other endcarries a flywheel of mass 80 kg. The young’s modulus for the shaft material is 2 x 106kg/cm2. Determine the natural frequency of longitudinal and transverse vibration of the shaft |
|
Answer» TAKE as a reference and slove the above question |
|
| 43. |
Rank the following objects from least inertia to most inertia.Baseball Small car Truck Feather Large train |
|
Answer» Feather, BASEBALL, SMALL car, TRUCK, Large TRain Explanation: |
|
| 44. |
Light enters from the air to glass having refractive index 1.50 calculate the speed of light in the glassgiven :: the speed of light in vacuum is = 3' 10 8' m/s |
Answer» Answer:-
• Given:-Refractive INDEX of glass = 1.50 Speed of light in VACCUM = • To Find:-Speed of light in glass = ? • Solution:-We know, → → → Therefore, the speed of light in glass is |
|
| 45. |
A vertical double-acting steam engine develops 75 KW at 250 r.p.m. The maximumfluctuation of energy is 30% of the work done per cycle. The maximum and minimum speeds are not to vary more than 1% on either side of the mean speed. Find the mass of the flywheel required if the radius of gyration is 0.6metres. |
|
Answer» 3456 Kg Explanation: I have ATTACHED a HANDWRITTEN Calculation to support the Answer. hope its OKAY. |
|
| 46. |
The velocity of a body moving in a straight line with auniform acceleration of 2 m/s2 is 10 m/s. Its velocity (inm/s) after an interval of 4 sis n m/s. Find the value of n.Answer:0123 4 5 6 7 78 • 9012 34 5 6 78.9Select your answer from radio buttons. |
|
Answer» The answer is 18m/s, i dont know aboit the radio BUTTONS bit the answer is 18 Explanation: we have that the velocity of the moving BODY of ACCELERATION 2m/s2 is 10 m/s then after 4 sec the velocity will be v=u+at i.e v= 10 + 4×2= 18m/s HOPE IT HELPS.... |
|
| 47. |
⦁ A box has dimensions 20 cm × 40 cm × 60 cm, and a mass of 50 kg.⦁ Calculate the weight of the box |
|
Answer» Answer: 500 kilograms Explanation: = 50 × 10 = 500 |
|
| 48. |
3515. If R = 2 cal. mol-1.°C-1 and hydrogen is assumed tobe an ideal gas, specific heat of that gas at constantpressure will beA) 7 cal.g-1.°C B) 5 cal.g 1.°C-1C)3.5 cal.g-1.°C-1 D)1.25 cal.g1.°C-1 |
|
Answer» Answer: Explanation: |
|
| 49. |
A. Objective Questions1. Write true or false for each statement(a) A coolie does no work against the force of gravity while carrying a luggage on a road(b) The energy stored in water of a dam is the kinetic energy.(c) The energy of a flying kite is kinetic energy.(d) Work done by a boy depends on the time in which he does work.(e) Power spent by a body depends on the time for which it does work.2. Fill in the blanks:(a) Work is said to be done by a forte only when _________(b) Work done = Force x _________(c) The energy of a body is its capacity to do ________(d) The S.I. unit of energy is _______(e) The potential energy is due to its _________ n and kinetic energy of body is due to its _________(f) Gravitational potential energy U = mass × force of gravity on unit mass × ________(g) Kinetic energy = ½ × mass × _______(h) Power P = ______ /time taken(i) The S. I. unit of power is ________(j) I.H.P. = _______Select the correct alternative (a) The S.I. unit of work is 1. second 2. metre 3. joule 4. Newton(b) No work is done by a force if the body 1. moves in direction of force 2. does not move 3. moves in opposite direction 4. none of the these(c) Two coolies A and B do some work in time 1 minute and 2 minute respectively. The power spent is 1. same by both coolies 2. is more by coolie A than by B 3. is less by coolie A than by B 4. nothing can be said.(d) The expression of power P is 1. P=mgh 2. P=P=1/223. P=F×d 4. P=F×d/t(e) 1 H.P is equal to 1. 1 W 2. 1 J 3. 746 J 4. 746 W(f) When a boy doubles his speed, his kinetic energy becomes 1. half 2. Double3. four times 4. no change(g) A boy lifts a luggage from height 2 m to 4 m. The potential energy will become1. half2. double 3. one-third 4. one-fourth |
|
Answer» Explanation: 1 (a) TRUE (b) False (C) True (d) False (E) True HOPE it helps you!! |
|