67486 + Interview Questions in Secondary School in Physics

1.	What is current and voltage
Answer» Current is RATE of FLOW of charges. Voltage is ELECTRIC potential energy per unit CHARGE.

Discussion

2.	A stone is dropped from the top of a tower 500 m high into a pond of water at the base of thetower. When is the splash heard at the top ? Given, g = 10 ms–2 and speed of sound = 340 m/s.
Answer» Distance, s = 500m acceleration, g = 10 m/s² initial speed, u = 0 let the time TAKEN for the stone to REACH the pond = t₁ s = ut₁ + 1/2 gt₁² ⇒ 500 = 0 + (1/2)×10×t₁² ⇒ t₁² = (2×500)/10 = 1000/10 = 100 ⇒ t₁ = √100 = 10s let the time taken by SOUND to reach the top of tower = t₂ speed of sound = 340 m/s t₂ = 500/340 = 1.47s total time = t₁+t₂ = 10+1.47 = 11.47s So the splash will be heard at the top after 11.47 SECONDS.

Discussion

3.	Real image 1/5th size of object is formed at a distance of 18 cm from the mirror. what is the nature of mirror ? calculate its focal length .
Answer» M = +1/5 or -1/5 and V = +18 cm or -18 cm So there are 4 possibilities. But v positive means behind convex mirror and hence, the image has to be erect. Hence m is positive only. There are 3 cases only. It is a mirror: m = -v/u 1/f = 1/v + 1/u CASE 1) m = +1/5 = -v/u let v = +18 cm u = - 5 v = -90 cm 1/f = 1/18 - 1/90 = 4/90 => f = +22.5 cm Convex Mirror. case II) m = +1/5 = -v/u let v = -18 cm u = +90 cm not possible. as u is always negative. case iii) m = -1/5 = -v/u let v = +18 cm u = +90 cm not possible case IV) m = -1/5 = -v/u u = 5 v v = -18 cm 1/f = -1/18 - 1/90 = -6/90 f = -15 cm concave mirror

Discussion

4.	Find the maximum velocity for the overturn of a car moving on a circular track of radius 100 m. The co-efficient of friction between the road and tyre is 0.2
Answer» For a car moving in a CIRCULAR TRACK, the necessary CENTRIPETAL force is provided by the friction. Let the mass of car = m maximum VELOCITY for over turn = v radius of track = 100m coefficient of friction = 0.2 $\frac{mv^2}{r}=\mu mg\\ \\ \frac{v^2}{100}=0.29.8\\ \\ v^2=1000.2*9.8=196\\ \\v= \sqrt{196}=\boxed{14\ m/s}$

Discussion

5.	State the characteristics of the image formed by a plane mirror?
Answer» An IMAGE formed by the plane mirror has the FOLLOWING CHARACTERISTICS, The same size as that of the object At same distance as that of the objectlater INVERSION takes place

Discussion

6.	The sound of an explosion on the surface of lake is heard by a boatman 100m away and a driver 100m below the point of explosion.(i) explain who will hear the sound of explosion first(ii) if the sound takes t s to reach the man how much time will it take to reach the driver? (speed of sound in air = 344 m/sspeed of sound in water = 1533 m/s )
Answer» For the boatman above the surface of water... SPEED of sound in air = 344 m/s distance COVERED = 100 m time TAKEN by sound = t sec velocity = distance / time 344 = 100 / t t = 100 / 344 t = 0.29 sec Now, for the man below the surface of water speed of sound in water = 1533 m/s distance covered = 100 m time taken = t But velocity = distance / time 1533 = 100 / t t = 100 / 1533 t = 0.06 sec So , the man under the water HEAR the sound of the EXPLOSION first....

Discussion

7.	When we touch a steel rod and a paper simultaneously we feel the rod is comparatively colder why?
Answer» When we touch a steel rod and a PAPER simultaneously in winter, we feel the rod is comparatively COLDER because though the TEMPERATURE of both steel rod and paper are same, as steel being a good CONDUCTOR of heat, heat from our hand flows to steel but there is no transfer of heat from our hand to paper as it is a INSULATOR. So we don't feel cold when we touch a paper but we do when we touch a steel rod.

Discussion

8.	State 2 conditions for echo to be heard . bats cannot see still they catch their prey . explain
Answer» Two conditions for echo to be HEARD are- the distance between the origin of SOUND and reflecting object MUCH be atleast 17m. And the reflecting object must be bigger then the wavelength of the sound. Bats cannot see so the PRODUCE a type of sound and listen to it's echo and hence locate and CATCH its prey

Discussion

9.	a small bottle weights 20 g when empty ans 22 g when filled with water. When it is filled with oil it weights 21.76g. What is the density of oil ?
Answer» Weight of EMPTY bottle = 20 g weight of water filled bottle = 22g weight of water = 22-2 = 2g density of water = 1 g/cm³ VOLUME of water = mass/density = 2/1 = 2 cm³ so capacity of bottle = 2cm³ so the volume of oil = 2cm³ weight of bottle filled with oil = 21.76g weight of oil = 21.76 - 20 = 1.76g density of oil = mass/volume = 1.76/2 = 0.88 g/cm³

Discussion

10.	the lungs performs 2.4j of work during each expansion . how many times per minute do they expand if their power is 2 j/s ?
Answer» *P = 2 j/s* *work done during EXPANSION = 2.4 j ( W )* *t = 1 minute = 60 seconds* $P = \frac{W}{t}$ **W = P t* = 2 60 = 120 J* total no. of expansion per minute = 120 / 2.4 = 50 ( answer )**

Discussion

11.	A solid sphere has a radius of 2cm and a mass of 0.05 kg. What is the relative density of the sphere ?
Answer» MASS = 0.05 kg = 50 g radius = 2 cm VOLUME = $\frac{4}{3} \pi r^3=33.51$ cm³ DENSITY = $\frac{mass}{volume} = \frac{50}{33.51}=<klux>1</klux>.49$ g/cm³ density of water = 1 g/cm³ Relative density = $\frac{density\ of\ material}{density\ of\ water} = \frac{1.49}{1}=1.49$ So relative density of sphere is 1.49.

Discussion

12.	What is tyndall effects
Answer» LIGHT scattering by particles in a COLLOID or particles in a fine SUSPENSION.

Discussion

13.	An aeroplane is flying horizontally with a velocity of 600 km/h and at a height of 1960 m. When it is vertically at a point A on the ground a bomb is released from it. The bomb strikes the ground at point B. The distance AB is
Answer» When the bomb is dropped, it will have an initial HORIZONTAL velocity which is EQUAL to the speed of the aeroplane. So the bomb fall and TRAVEL forward too. initial horizontal velocity, $v_x$ = 600 km/h $v_x=600\ km/h = 600* \frac{5}{18}\ m/s=166.67\ m/s$ initial vertical velocity, $v_y$ = 0 height, h = 1960m time taken to fall = t $h=v_yt+ \frac{1}{2}gt^2\\ \\1960=0+ \frac{1}{2}9.8t^2\\ \\1960=4.9t^2\\ \\t^2= \frac{1960}{4.9}=400\\ \\t= \sqrt{400}=20s$ In 20s, the horizontal DISTANCE travelled is AB $AB=v_xt=166.6720=\boxed{3333.4\ m}$

Discussion

14.	the volume of 50g of a substance is 20 cm3 .If the density of water is 1g/cm3 , will the substance sink or float when placed on the surface of water? what will be the mass of water displaced by the distance ?
Answer» MASS = 50g volume = 20cm³ DENSITY = mass/volume = 50/20 = 2.5 g/cm³ density of water = 1 g/cm³ Since the density of the substance is GREATER than the density of water, it will sink in water. The volume of water displaced = 20 cm³ mass of water displaced = volume×density = 20×1 = 20G

Discussion

15.	Define wavelength of sound.
Answer» Wavelength is the distance between 2 CONTINOUS compressions/crests or 2 continous rarefactions/troughs. It is DENOTED by the SYMBOL lamda and its SI unit is metres (m).

Discussion

16.	In dynamo, energy transfer take place from mechanical energy to electrical energy. Is it right if we write it asIn dynamo energy transfer takes place from energy of water to electrical energy. Please reply urgently.
Answer» Yes, it is right if we WRITE ENERGY of WATER is CONVERTED to electrical energy. The gravitational potential energy STORED in water is first converted into the rotational kinetic energy of the turbine which is finally converted into electrical energy.

Discussion

17.	In a water tank, on throwing a stone 20 full ripples are produced in 1 sec the distance between the creast and through is 10 cm. calculate:a) the wavelength of rippleb) frequency of ripplec) velocity of ripple
Answer» As distance between crest and TROUGH is 10 m, the wavelength is 102 = 20 m Frequency = NUMBER of cycles per SECOND or, in this situation, number of full waves per second = 20 Hz Velocity of ripple = Wavelength frequency = 20 * 20 = 400 m/s

Discussion

18.	Figure shows the position of layers of air, at one moment , as a sound wave of constant frequency passes through the air. Compressions are labeled as C andRarefraction are labelled as R \\\\\\\\\ \ \ \ \ \\\\\\\\ \ \ \ \ \\\\\\\\\ \ \ \ \ \\\\\\\\ \ \ \ \ \\\\\\\\\ \ \ \ \ \\\\\\\\ \ \ \ \ State how figure would change if a) sound has higher frequency b) the sound were louder c) On figure draw a line marked with arrows to show the wavelength of sound.
Answer» A) The speed of sound in air at a PARTICULAR temperature and air pressure is same. So if the FREQUENCY increases, then the wavelength DECREASES. The distance between the successive COMPRESSIONS and rarefactions decreases. \\\\ \ \ \ \\\\ \ \ \ \\\\ \ \ \ \\\\ b) The loudness comes from the amplitude of vibrations. But the wavelength remains same. So distance between the rarefactions and compressions remains same. c) Draw a line from the CENTER of a compression to the center of next consecutive compression.

Discussion

19.	Why tip of pin is sharp but head is broad?
Answer» The pin SHARP but head is broad because if we exerts more pressure then it VIL easily penetrate but if we exerts less pres. on a blunt pin then it will not easily penetrate .. Pointed nip has very small SURFACE area DUE to which Pres. is required less and in the case of blunt pin surface area is more so.. pres. will be exerted more...

Discussion

20.	If 20 waves are produced per second, what is the frequency in hertz?
Answer» Thanks for asking the question. Frequency is defined as the number of waves PASSING through a PARTICULAR point in a time of one SECOND. In the given question, about twenty waves are passing through a point in one second hence the frequency will be one HERTZ. Here hertz is the SI unit of frequency. Hope it HELPS.

Discussion

21.	How to take reading of ammeter and voltmeter? how to find the least count in ammeter and voltmeter with example ?please answer fast............................
Answer» 1. CONNECT Ammeter in series and voltmeter in parallel in an electrical circuit. Then Note down the READINGS in ammeter and voltmeter. 2.Least count is the smallest VALUE that can be measured by the measuring instrument Least count FORMULA:= value measured in n divisions/n Least count of ammeter: The smallest value of current that can be measured For example:Let us calculate Least count of ammeter- 0-300mA Least count=range of ammeter divided by NUMBER of division Refer attachment 1:for ammeter picture Small divisions=30 suppose there are 30 division then, least count is =300/30=10mA Least count of Voltmeter: For example let us calculate least count of Voltmeter 0-15volts. Please refer to Attachment2 for voltmeter picture Main division 15 sundivision 30 least count=15/30 =1/2=0.5 Least count of this voltmeter is 0.5

Discussion

22.	Why does fish weighs less in water as compared to air? .
Answer» FISH weighs LESS in water as compared to air because of the BUOYANT force. As the fish SWIMS , some of the water is displaced by it and thus the water offers an upward force ..

Discussion

23.	Rocket-powered sleds are used to test the human response to acceleration. If a rocket-powered sled is accelerated to a speed of 444 m/s in 1.83 seconds, then what is the acceleration and what is the distance that the sled travels?
Answer» V=444m/s u=0m/s v=u + at 444=0 + a1.83 a=242.623 s=ut + 1/2at^2 s=406.26m

Discussion

24.	Explain working of electric motor
Answer» Electric motor Electric motor is a device that converts electric energy into mechanical energy. Flemings right hand rule is also know as motor rule.. It consist of ~SN magnetic poles ~ABCD coil on armature ~B1 B2 Brushes ~S1 S2 split rings ~L lamp A motor works on the principle that a conductor carrying current in magnetic field EXPERIENCES a mechanical force and works on direct current called DC motor . A simple DC motor consist of rectangular coil of insulated COPPER wire ABCD mounted between the poles N and S of a powerful magnet of wire ends of a coil are connected to two HALVES S1 and S2 of a split ring the conducting brushes B1 and B2 are in constant with S1 and S2 respectively these brushes are connected to poles of a battery. An electricity current be PASSED through the coil in the direction ABCD it produces mechanical force that is it makes the armature to rotate. hope my answer helped you.....

Discussion

25.	Explain the process of working ofelectric motor
Answer» An electric motor at home takes in AC power. The Alternating current direction is changed at the half cycle of the time period of the supply current. An electric motor converts electrical energy into mechanical (Rotational) energy. It USES the principle of a electro-magnetic force exerted on a current carrying conductor (loop) coil, when it is placed inside a strong magnetic field. In side the motor, we have essentially the same parts as the generator. We have a stator - which consists of TWO strong permanent magnets North and south poles in circular SHAPE. In between the magnets, there is a rotor. It is in the shape of a cylindrical shaft. Around it, in the shape of a rectangle (planar surface to planar surface) there are windings made of a good and thick conductor. There is an air gap between the rotor and the stator. When current FLOWS in the coil, the magnetic field exerts force on the coil, so the rotor ROTATES. When the half cycle is reached ie., 1/2 rotation is complete, the direction of the current is changed if it is AC generator. This is done by using what is called as a commutator (using slip rings). If it is a DC generator, then the direction is in one direction. So there is no problem.

Discussion

26.	A person is not able to read from a book until he keeps it at 50 cm. Determine the power of corrective lens.
Answer» SINCE the PERSON is able to read clearly from a distance of 50 CM, focal length REQUIRED = 50 cm = 0.5m Power = $\frac{1}{f}= \frac{1}{0.5}=<klux>2D</klux>$ Power of corrective lens is 2D.

Discussion

27.	A) A ship sends out ultrasound that returns from the seabed and is detected after 3.42 s. If the speed of ultrasound through seawater is 1531 m/s, what is the distance of the seabed from the ship ?b) A ship sends out ultrasound produced by transmitter that returns from the sea bed and detected after 3.42 s. If the speed of ultrasound waves through sea water is 1530 m/s, what is the distance of the sea bed from the ship?
Answer» Distance of sea BED from SHIP = SPEED of sound * time taken / 2 = 1531 * 3.42 / 2 = 2618 m

Discussion

28.	When two resistances R1 and R2 are connected in series, they consume 12W power. When theyare connected in parallel, they consume 50 W power. What is the ratio of the powers of R1 and R2?
Answer» So for series connection equivalent resistance(R) = R1 + R2 for parallel connection equivalent resistance(r) = $\frac{R1R2}{R1+R2}$ so we know P = VI ⇒ P = I²R so for series connection 12 = V²/R ..... {i} for parallel connection 50 = V²/r .............. {II} dividing i from ii so $\frac{50}{12}= \frac{R}{r}$ ⇒ $\frac{25}{6}= \frac{(R1+R2)^2}{R1R2}$ ⇒ 6R1² + 6R2² - 13R1R2 = 0 ⇒ 6R1² - 9R1R2 - 4R1R2 + 6R2²= 0 ⇒ 3R1(2R1 - 3R2) - 2R2(2R1 - 3R2) = 0 ⇒ (2R1 - 3R2)(2R1 - 3R2) = 0 so $\frac{R1}{R2}= \frac{3}{2},\frac{2}{3}$ ANSWER*

Discussion

29.	What is the difference between natural and artificial magnet ?
Answer» ONE is NATURAL.........other is ARTIFICIAL

Discussion

30.	Flash and thunder are produced simultaneously. But thunder is heard a fewseconds after the flash is seen, why? How does the speed of sound in air vary withrise in density of the medium?
Answer» Flash and thunder are PRODUCED are produced simultaneously,but the flash is seen first and then the sound is heard.This is because the SPEED of sound in air is very LESS than the speed of light in air. Speed of sound in air : 334ms⁻¹ Speed of light in air : 3X10⁸ms⁻¹ With the increase in DENSITY of the MEDIUM, the speed of sound also increases.

Discussion

31.	a current of 0.5 A is drawn by a filament of an electric bulb for 10 min. find the amount of electric charge that flows through the current?
Answer» Current, I = 0.5 A time, t = 10 minute = 10×60 = 600 seconds let the TOTAL charge FLOWN = Q $I= \frac{Q}{t} \\ \\Q=It\\ \\Q=0.5600\ C\\ \\Q =\boxed{300\ C}$

Discussion

32.	two bodies with equal masses move with uniform velocities v and 2v respectively . find the ratio of the kinetic energy .
Answer» *let two bodies of MASSES ,* *BODY X = m* *body y = m ( because they are equal in mass )* *given .* *body x = V* *body y = 2V* *k.e. of x = 1/2mv^2* *k.e. of y = 1/2m(2v)^2* $\frac{1}{2} m 4v^2$ = $2mv^2$ = $\frac{K.E.of x}{K.E.of y}$ ratio =* $\frac{ \frac{1mv^2}{2} }{2mv^2}$ = = 1/4 = 1 : 4*

Discussion

33.	calculate the power developed by a 110 Kg man climbing up a vertical stairway at the rate of 2.0m/s . take g = 9.8 m/s^2
Answer» MASS = 110kg g = 9.8 m/s² velocity, v = 2m/s weight FORCE , F = mg = 110×9.8 = 1078N POWER = Force × velocity = 1078×2 = 2156 Watt So power developed is 2156W.

Discussion

34.	Question 1 : A carnot engine whose sink is at 300K has an efficiency of 40%. By how much should the Temperature of source be increased to as to increase its efficiency by 50% of original efficiency ?A)150 K B) 250 KC)300 KD)450 K
Answer» Temperature of sink ( $T_c$ ) = 300K Temperature of SOURCE = $T_h$ Initial efficiency = 40% $efficiency,\ \eta_1=1- \frac{T_c}{T_h_1} \\ \\0.4=1- \frac{300}{T_h_1} \\ \\ \frac{300}{T_h_1} =1-0.4=0.6\\ \\T_h_1= \frac{300}{0.6}=500K$ If we NEED to INCREASE the efficiency by 50% of original, efficiency = 40% + (50/100)×40% = 40%+20% = 60% $efficiency,\ \eta_2=1- \frac{T_c}{T_h_2} \\ \\0.6=1- \frac{300}{T_h_2} \\ \\ \frac{300}{T_h_2} =1-0.6=0.4\\ \\T_h_2= \frac{300}{0.4}=750K$ Change in temperature = $750K-500K=\boxed{250K}$

Discussion

35.	A hockey ball of mass 200g travelling at 10 ms¹is struck by a hockey stick so as to return along a straight path in with a velocity of 5m¹. Find the change of momentum
Answer» EXPLANATION: why have you WRITTEN TWO TIMES

35.

A hockey ball of mass 200g travelling at 10 ms¹is struck by a hockey stick so as to return along a straight path in with a velocity of 5m¹. Find the change of momentum

Answer»

EXPLANATION:

why have you WRITTEN TWO TIMES

Discussion

36.	A diamond is a brilliant gem becausea. It has low index of refractionb. It has big critical anglec. Most of the light is refractedd. Most of the light is reflected internally
Answer» EXPLANATION: *Because of its BRILLIANT SHINE, LUSTRE and HARDNESS*.

36.

A diamond is a brilliant gem becausea. It has low index of refractionb. It has big critical anglec. Most of the light is refractedd. Most of the light is reflected internally

Answer»

EXPLANATION:

Because of its BRILLIANT SHINE, LUSTRE and HARDNESS.

Discussion

37.	The distance travelled by a object are, distance:(m) 0,25,50,75,100 and time:(s) 0,2,4,6,8. What is the distance covered by the object at 5 and 7 seconds
Answer» ANSWER: In 1 sec distance travelled by OBJECT= 25\2 In 7 sec distance COVERED by object are =25\2*7

37.

The distance travelled by a object are, distance:(m) 0,25,50,75,100 and time:(s) 0,2,4,6,8. What is the distance covered by the object at 5 and 7 seconds

Answer»

ANSWER:

In 1 sec distance travelled by OBJECT= 25\2

In 7 sec distance COVERED by object are =25\2*7

Discussion

38.	three resistances each equal to r are connected as shown in adjacent figure. the equivalent resistance between A and B is
Answer» ANSWER: r/3 Explanation: U should TRY this by METHOD of same POTENTIAL

38.

three resistances each equal to r are connected as shown in adjacent figure. the equivalent resistance between A and B is

Answer»

ANSWER:

r/3

Explanation:

U should TRY this by METHOD of same POTENTIAL

Discussion

39.	Two blocks of masses m and M are moving with speeds V1and V2 (V1 > V2) in the same direction on the frictionlesssurface respectively, M being ahead of m.An ideal spring of force constant k is attached to the backside of M (as shown). The maximumcompression of the spring when the block collides is :(A) v1 VWomac(B) V2(C) (V1 - V2) ImM(D) None of above is correct.V(M+ m)K
Answer» Answer: Explanation:CHECK the ATTACHMENT this must be a correct solution of GIVEN PROBLEM

39.

Two blocks of masses m and M are moving with speeds V1and V2 (V1 > V2) in the same direction on the frictionlesssurface respectively, M being ahead of m.An ideal spring of force constant k is attached to the backside of M (as shown). The maximumcompression of the spring when the block collides is :(A) v1 VWomac(B) V2(C) (V1 - V2) ImM(D) None of above is correct.V(M+ m)K

Answer»

Answer:

Explanation:CHECK the ATTACHMENT this must be a correct solution of GIVEN PROBLEM

Discussion

40.	वाष्पन की दर किस पर निर्भर करती है?
Answer» ANSWER: *PLEASE FOLLOW ME:)* EXPLANATION: वाष्पन (EVAPORATION), किसी द्रव के सतह के कणों का गैस में बदलने की वह प्रक्रिया है जिसमें द्रव की सतह के ठीक ऊपर स्थित गैस संतृप्त न हो।

40.

वाष्पन की दर किस पर निर्भर करती है?

Answer»

ANSWER:

PLEASE FOLLOW ME:)

EXPLANATION:

वाष्पन (EVAPORATION), किसी द्रव के सतह के कणों का गैस में बदलने की वह प्रक्रिया है जिसमें द्रव की सतह के ठीक ऊपर स्थित गैस संतृप्त न हो।

Discussion

41.	A sound produced by a ship echoes back after 8 seconds. what will be the depth of the sea?
Answer» Answer:6000 m Explanation: Time taken = 8 seconds So, Time taken to reach the SEA bottom = 4 seconds SPEED of sound in SEAWATER = 1500 m/s *Distance = speed time = 15004* = 6000 m

41.

A sound produced by a ship echoes back after 8 seconds. what will be the depth of the sea?

Answer»

Answer:6000 m

Explanation:

Time taken = 8 seconds

So,

Time taken to reach the SEA bottom = 4 seconds

SPEED of sound in SEAWATER = 1500 m/s

Distance = speed * time

= 1500*4

= 6000 m

Discussion

42.	Why are red, green and blue primary colors of light whereas it should be yellow instead of green?
Answer» ANSWER: The INK reduces the light that would OTHERWISE be reflected. Such a model is called subtractive because inks "SUBTRACT" the colors red, green and blue from white light. ... In additive color models, such as RGB, white is the "additive" COMBINATION of all primary colored lights, while black is the absence of light.

42.

Why are red, green and blue primary colors of light whereas it should be yellow instead of green?

Answer»

ANSWER:

The INK reduces the light that would OTHERWISE be reflected. Such a model is called subtractive because inks "SUBTRACT" the colors red, green and blue from white light. ... In additive color models, such as RGB, white is the "additive" COMBINATION of all primary colored lights, while black is the absence of light.

Discussion

43.	A man wearing bullet proof jacket
Answer» ANSWER: to SAVE himself from BULLETS

43.

A man wearing bullet proof jacket

Answer»

ANSWER:

to SAVE himself from BULLETS

Discussion

44.	27. A horizontal force F pulls a 20 kg box at a constantspeed along a horizontal floor. If the coefficientof friction between the box and the floor is 0.25,how much work is done by the force F in movingthe box through a distance of 2 m?(a) 49 J (b)98J (c) 147J (d) 196J
Answer» ANSWER: F=fmg g=9.8m/s2 f=0.25 m=20 F=0.25×20×9.8=49 W=Fx =49×2=98

44.

27. A horizontal force F pulls a 20 kg box at a constantspeed along a horizontal floor. If the coefficientof friction between the box and the floor is 0.25,how much work is done by the force F in movingthe box through a distance of 2 m?(a) 49 J (b)98J (c) 147J (d) 196J

Answer»

ANSWER:

F=fmg

g=9.8m/s2

f=0.25

m=20

F=0.25×20×9.8=49

W=Fx

=49×2=98

Discussion

45.	Derrivation of series and parallel combination of Resistance.
Answer» Answer: In a parallel combination of RESISTORS the voltage (or potential difference) ACROSS each resistor is the same and is equal to the applied voltage i.e. i.e. V1 = V2 = V3 = V

45.

Derrivation of series and parallel combination of Resistance.

Answer»

Answer:

In a parallel combination of RESISTORS the voltage (or potential difference) ACROSS each resistor is the same and is equal to the applied voltage i.e.

i.e. V1 = V2 = V3 = V

Discussion

46.	Write the geometrical meaning of magnetic moment
Answer» Answer: The magnetic MOMENT is the magnetic strength and ORIENTATION of a magnet or other OBJECT that PRODUCES a magnetic field. ... The magnetic dipole moment of an object is readily defined in terms of the torque that object experiences in a GIVEN magnetic field.

46.

Write the geometrical meaning of magnetic moment

Answer»

Answer:

The magnetic MOMENT is the magnetic strength and ORIENTATION of a magnet or other OBJECT that PRODUCES a magnetic field. ... The magnetic dipole moment of an object is readily defined in terms of the torque that object experiences in a GIVEN magnetic field.

Discussion

47.	अहम् औरछा! अह निवाड़ीमण्डले स्थितं प्राचीनं नगरम अस्मि। पूर्व स्वतन्त्रराज्यरूपण मम परिकआसीत्। मम स्थापना षोडशशताब्दे बुन्देलाराजपूतेन रुद्रप्रतापेन कृता। मानाहदप्रतापेन कता। माम् परितः सघन वनम् अग्निआस्मन् वन सागोनवृक्षाः अधिकाः भवन्ति । सागौनकाष्ठं बहुमूल्यं भवति। मननालगावः, वानराः स्वच्छन्दं विचरन्ति। अन्येऽपि वन्यपशवः निर्भया: वसन्ति । एतषा वन्यपशूना रक्षणाशासनन इदानीम् अभयारण्यं निर्मितम् । मम परिक्षेत्रे चतस्रः प्रमुखा: नद्यः प्रवहन्ति। धसान-जामिना-जताराबतवा नाम्न्यः नद्यः जलस्य आवश्यकतां पूरयन्ति, कृषि, वन, भूमिं च सिञ्चन्ति। जामिनानद्या: तार जम्बुवाअधिकाः भवन्ति । मम दक्षिणभागे जामिनीवेत्रवत्योः सङ्गमः अस्ति। तत्र सङ्गमात् जलस्य सतवास भवानअत एव जनाः लोकभाषायां तं स्थलं 'सप्तधारा' इति वदन्ति। वेत्रवत्याः तटे मम पुरातनः एतहासिकदुग: आस्त। बहूनि मन्दिराणि अपि सन्ति । तत्रैव राज्ञां समाधयः अपि सन्ति । तट एक भव्य समाजामादविद्यत। एतद् कलात्मकम् ऐतिहासिकं च मन्दिरम् अस्ति। मन्दिरे रामस्य, लक्ष्मणस्य, सातायाश्च भव्या-मनोरमाः प्रतिमाः प्रतिष्ठिताः) मन्दिरस्यउद्याने विषपानस्थलं वर्तते । अत्रैव वीरःहरदौल: विषपानं कृतवान्। मम भूमौअनेके वीराः, धीराः, श्रेष्ठाः पुरुषाःअभवन्। तेषु हरदौल: मम अतिप्रियःआसीत्। सः राज्ञः जुझारसिंहस्य प्रियःअनजः आसीत।
Answer» Answer: yaar pori kahani hi LIKH dali, karna KYA hain go bataya nahi follow me guys please and INBOX me

47.

अहम् औरछा! अह निवाड़ीमण्डले स्थितं प्राचीनं नगरम अस्मि। पूर्व स्वतन्त्रराज्यरूपण मम परिकआसीत्। मम स्थापना षोडशशताब्दे बुन्देलाराजपूतेन रुद्रप्रतापेन कृता। मानाहदप्रतापेन कता। माम् परितः सघन वनम् अग्निआस्मन् वन सागोनवृक्षाः अधिकाः भवन्ति । सागौनकाष्ठं बहुमूल्यं भवति। मननालगावः, वानराः स्वच्छन्दं विचरन्ति। अन्येऽपि वन्यपशवः निर्भया: वसन्ति । एतषा वन्यपशूना रक्षणाशासनन इदानीम् अभयारण्यं निर्मितम् । मम परिक्षेत्रे चतस्रः प्रमुखा: नद्यः प्रवहन्ति। धसान-जामिना-जताराबतवा नाम्न्यः नद्यः जलस्य आवश्यकतां पूरयन्ति, कृषि, वन, भूमिं च सिञ्चन्ति। जामिनानद्या: तार जम्बुवाअधिकाः भवन्ति । मम दक्षिणभागे जामिनीवेत्रवत्योः सङ्गमः अस्ति। तत्र सङ्गमात् जलस्य सतवास भवानअत एव जनाः लोकभाषायां तं स्थलं 'सप्तधारा' इति वदन्ति। वेत्रवत्याः तटे मम पुरातनः एतहासिकदुग: आस्त। बहूनि मन्दिराणि अपि सन्ति । तत्रैव राज्ञां समाधयः अपि सन्ति । तट एक भव्य समाजामादविद्यत। एतद् कलात्मकम् ऐतिहासिकं च मन्दिरम् अस्ति। मन्दिरे रामस्य, लक्ष्मणस्य, सातायाश्च भव्या-मनोरमाः प्रतिमाः प्रतिष्ठिताः) मन्दिरस्यउद्याने विषपानस्थलं वर्तते । अत्रैव वीरःहरदौल: विषपानं कृतवान्। मम भूमौअनेके वीराः, धीराः, श्रेष्ठाः पुरुषाःअभवन्। तेषु हरदौल: मम अतिप्रियःआसीत्। सः राज्ञः जुझारसिंहस्य प्रियःअनजः आसीत।

Answer»

Answer:

yaar pori kahani hi LIKH dali, karna KYA hain go bataya nahi

follow me guys please and INBOX me

Discussion

48.	What is velocity's pure meaning
Answer» Answer: The velocity of an OBJECT is the rate of change of its position with respect to a frame of reference, and is a function of time. Velocity is equivalent to a specification of an object's speed and direction of motion (e.g. 60 km/h to the north). Velocity is a fundamental concept in kinematics, the branch of classical mechanics that describes the motion of bodies. Velocity is a physical vector quantity; both magnitude and direction are needed to define it. The scalar absolute value (magnitude) of velocity is called speed, being a coherent DERIVED unit WHOSE quantity is measured in the SI (metric system) as metres per second (m/s) or as the SI base unit of (m⋅s−1). For example, "5 metres per second" is a scalar, whereas "5 metres per second east" is a vector. If there is a change in speed, direction or both, then the object has a CHANGING velocity and is said to be undergoing an acceleration. MARK THE BRAINLIEST.... PLZZZZ

48.

What is velocity's pure meaning

Answer»

Answer:

The velocity of an OBJECT is the rate of change of its position with respect to a frame of reference, and is a function of time. Velocity is equivalent to a specification of an object's speed and direction of motion (e.g. 60 km/h to the north). Velocity is a fundamental concept in kinematics, the branch of classical mechanics that describes the motion of bodies.

Velocity is a physical vector quantity; both magnitude and direction are needed to define it. The scalar absolute value (magnitude) of velocity is called speed, being a coherent DERIVED unit WHOSE quantity is measured in the SI (metric system) as metres per second (m/s) or as the SI base unit of (m⋅s−1). For example, "5 metres per second" is a scalar, whereas "5 metres per second east" is a vector. If there is a change in speed, direction or both, then the object has a CHANGING velocity and is said to be undergoing an acceleration.

MARK THE BRAINLIEST....

PLZZZZ

Discussion

49.	What are collisions occur detail?elastic and elastic collisions
Answer» Answer: Certain collisions are REFERRED to as elastic collisions. Elastic collisions are collisions in which both momentum and kinetic ENERGY are CONSERVED. The total system kinetic energy before the collision equals the total system kinetic energy after the collision

49.

What are collisions occur detail?elastic and elastic collisions

Answer»

Answer:

Certain collisions are REFERRED to as elastic collisions. Elastic collisions are collisions in which both momentum and kinetic ENERGY are CONSERVED. The total system kinetic energy before the collision equals the total system kinetic energy after the collision

Discussion

50.	When is the velocity of a body said to be negative in a one dimensional motion
Answer» ANSWER: When it is in oppposite DIRECTION COMPARING to other BODY

50.

When is the velocity of a body said to be negative in a one dimensional motion

Answer»

ANSWER:

When it is in oppposite DIRECTION COMPARING to other BODY

Discussion

Explore topic-wise InterviewSolutions in Current Affairs.

What is current and voltage

A stone is dropped from the top of a tower 500 m high into a pond of water at the base of thetower. When is the splash heard at the top ? Given, g = 10 ms–2 and speed of sound = 340 m/s.

Real image 1/5th size of object is formed at a distance of 18 cm from the mirror. what is the nature of mirror ? calculate its focal length .

Find the maximum velocity for the overturn of a car moving on a circular track of radius 100 m. The co-efficient of friction between the road and tyre is 0.2

State the characteristics of the image formed by a plane mirror?

When we touch a steel rod and a paper simultaneously we feel the rod is comparatively colder why?

State 2 conditions for echo to be heard . bats cannot see still they catch their prey . explain

a small bottle weights 20 g when empty ans 22 g when filled with water. When it is filled with oil it weights 21.76g. What is the density of oil ?

the lungs performs 2.4j of work during each expansion . how many times per minute do they expand if their power is 2 j/s ?

A solid sphere has a radius of 2cm and a mass of 0.05 kg. What is the relative density of the sphere ?

What is tyndall effects

An aeroplane is flying horizontally with a velocity of 600 km/h and at a height of 1960 m. When it is vertically at a point A on the ground a bomb is released from it. The bomb strikes the ground at point B. The distance AB is

the volume of 50g of a substance is 20 cm3 .If the density of water is 1g/cm3 , will the substance sink or float when placed on the surface of water? what will be the mass of water displaced by the distance ?

Define wavelength of sound.

In dynamo, energy transfer take place from mechanical energy to electrical energy. Is it right if we write it asIn dynamo energy transfer takes place from energy of water to electrical energy. Please reply urgently.

In a water tank, on throwing a stone 20 full ripples are produced in 1 sec the distance between the creast and through is 10 cm. calculate:a) the wavelength of rippleb) frequency of ripplec) velocity of ripple

Why tip of pin is sharp but head is broad?

If 20 waves are produced per second, what is the frequency in hertz?

How to take reading of ammeter and voltmeter? how to find the least count in ammeter and voltmeter with example ?please answer fast............................

Why does fish weighs less in water as compared to air? .

Rocket-powered sleds are used to test the human response to acceleration. If a rocket-powered sled is accelerated to a speed of 444 m/s in 1.83 seconds, then what is the acceleration and what is the distance that the sled travels?

Explain working of electric motor

Explain the process of working ofelectric motor

A person is not able to read from a book until he keeps it at 50 cm. Determine the power of corrective lens.

When two resistances R1 and R2 are connected in series, they consume 12W power. When theyare connected in parallel, they consume 50 W power. What is the ratio of the powers of R1 and R2?

What is the difference between natural and artificial magnet ?

Flash and thunder are produced simultaneously. But thunder is heard a fewseconds after the flash is seen, why? How does the speed of sound in air vary withrise in density of the medium?

a current of 0.5 A is drawn by a filament of an electric bulb for 10 min. find the amount of electric charge that flows through the current?

two bodies with equal masses move with uniform velocities v and 2v respectively . find the ratio of the kinetic energy .

calculate the power developed by a 110 Kg man climbing up a vertical stairway at the rate of 2.0m/s . take g = 9.8 m/s^2

Question 1 : A carnot engine whose sink is at 300K has an efficiency of 40%. By how much should the Temperature of source be increased to as to increase its efficiency by 50% of original efficiency ?A)150 K B) 250 KC)300 KD)450 K

A hockey ball of mass 200g travelling at 10 ms¹is struck by a hockey stick so as to return along a straight path in with a velocity of 5m¹. Find the change of momentum

A diamond is a brilliant gem becausea. It has low index of refractionb. It has big critical anglec. Most of the light is refractedd. Most of the light is reflected internally

The distance travelled by a object are, distance:(m) 0,25,50,75,100 and time:(s) 0,2,4,6,8. What is the distance covered by the object at 5 and 7 seconds

three resistances each equal to r are connected as shown in adjacent figure. the equivalent resistance between A and B is​

वाष्पन की दर किस पर निर्भर करती है?​

PLEASE FOLLOW ME:)

A sound produced by a ship echoes back after 8 seconds. what will be the depth of the sea?​

Why are red, green and blue primary colors of light whereas it should be yellow instead of green?​

A man wearing bullet proof jacket

27. A horizontal force F pulls a 20 kg box at a constantspeed along a horizontal floor. If the coefficientof friction between the box and the floor is 0.25,how much work is done by the force F in movingthe box through a distance of 2 m?(a) 49 J (b)98J (c) 147J (d) 196J​

Derrivation of series and parallel combination of Resistance.​

Write the geometrical meaning of magnetic moment​

What is velocity's pure meaning​

What are collisions occur detail?elastic and elastic collisions​

When is the velocity of a body said to be negative in a one dimensional motion​

three resistances each equal to r are connected as shown in adjacent figure. the equivalent resistance between A and B is

वाष्पन की दर किस पर निर्भर करती है?

A sound produced by a ship echoes back after 8 seconds. what will be the depth of the sea?

Why are red, green and blue primary colors of light whereas it should be yellow instead of green?

27. A horizontal force F pulls a 20 kg box at a constantspeed along a horizontal floor. If the coefficientof friction between the box and the floor is 0.25,how much work is done by the force F in movingthe box through a distance of 2 m?(a) 49 J (b)98J (c) 147J (d) 196J

Derrivation of series and parallel combination of Resistance.

Write the geometrical meaning of magnetic moment

What is velocity's pure meaning

What are collisions occur detail?elastic and elastic collisions

When is the velocity of a body said to be negative in a one dimensional motion