Description : The power of a thin convex lens of glass is `5 dioptre`. When it is immersed in a liquid of refractive index `mu`, it behave like a diverging lens of
Last Answer : The power of a thin convex lens of glass is `5 dioptre`. When it is immersed in a liquid of refractive index ... liquid, if `mu` of glass `= 3//2`.
Description : Fig shows a small air bubble inside a glass sphere `(mu = 1.5)` of radius 10 cm. the bubble is 4.0 cm below the surface and is viewed normally from th
Last Answer : Fig shows a small air bubble inside a glass sphere `(mu = 1.5)` of radius 10 cm. the ... from the outside. Find the apparent depth of the bubble.
Description : A luminous object O is located at the bottom of a big pool of liquid of refractive index `mu` and depth h. The object O emits rays upwards in all dire
Last Answer : A luminous object O is located at the bottom of a big pool of liquid of refractive index `mu` ... Determine the radius and the area of the circle .
Description : In Fig. a plane mirror lies at a height h above the bottom of a beaker containingwater (refractive index `mu`) upto a height f. Find the position of t
Last Answer : In Fig. a plane mirror lies at a height h above the bottom of a beaker containingwater (refractive index ... f. Find the position of the image of the
Description : A convex lens of refractive index 1.5 is immersed in a liquid of refractive index (i) 1.6 (ii) 1.3 and (iii) 1.5. what changes happens to the focal le
Last Answer : A convex lens of refractive index 1.5 is immersed in a liquid of refractive index (i) 1.6 (ii) ... the focal length of the lens in the three cases ?
Description : The focal length of a plano-convex lens is 20 cm in air. Refractive index of glass is 1.5. Calculate (i) the radius of curvature of lens surface and (
Last Answer : The focal length of a plano-convex lens is 20 cm in air. Refractive index of glass is 1.5. ... length when immersed in liquid of refractive index 1.6
Description : The focal length of a double convex lens is equal to radius of curvature of either surface. The refractive index of its material is
Last Answer : The focal length of a double convex lens is equal to radius of curvature of either surface. The refractive index of its material is
Description : A spherical convex surface separates object and image space of refractive index `1.0 and 4/3.` If radius of curvature of the surface is `10cm,` find i
Last Answer : A spherical convex surface separates object and image space of refractive index `1.0 and 4/3.` If ... of the surface is `10cm,` find its power.
Description : A cylindrical rod of iron whose height is eight times its radius is melted and cast into spherical balls each of half the radius of the cylinder. -Maths 9th
Last Answer : Let radius of iron rod = r ∴∴ Height = 8r ∴∴ Volume of iron rod =π×(r)2×8r⇒8πr3=π×(r)2×8r⇒8πr3 ⇒⇒ Radius of spherical ball =r2=r2 Volume of spherical ball =43π(r2)3=43π(r2)3 Let n balls are casted ∴n×43π(r38)=8πr3∴n×43π(r38)=8πr3 ⇒n6=8⇒n=48
Description : A cylindrical rod of iron whose radius is one-fourth of its height is melted and cast into spherical balls of the same radius as that of the cylinder. -Maths 9th
Last Answer : Let radius of cylindrical rod =r ⇒ height =4r Volume of cylindrical rod =πr2h =πr2(4r) =4πr3 Volume of spherical balls of radius r=34πr3 No. of balls =34πr34πr3=
Description : A hemispherical bowl is made of steel, 0.25 cm thick. The inner radius of the bowl is 5cm. Find the outer curved surface of the bowl. -Maths 9th
Last Answer : Inner radius of hemispherical bowl = 5cm Thickness of the bowl = 0.25 cm Outer radius of hemispherical bowl = (5+0.25) cm = 5.25 cm Formula for outer CSA of hemispherical bowl = 2πr2, where r is radius of ... 22/7) (5.25)2 = 173.25 Therefore, the outer curved surface area of the bowl is 173.25 cm2.
Description : Calculate the surface area of a hemispherical dome of a temple with radius 14 m to be whitewashed from outside. -Maths 9th
Last Answer : Here, radius of hemispherical dome (r) = 14 m Surface area of dome = 2πr2 = 2 × 22 / 7 × 14 × 14 = 1232 m2 Hence , total surface area to be whitewashed from outside is 1232 m2
Description : From the following which type of work envelope is made in jointed arm robot a.Rectangular work envelope b.Cylindrical work envelope c.Spherical or hemispherical work envelope d.C
Last Answer : b.Cylindrical work envelope
Description : From the following which type of work envelope is made in jointed arm robot. (A) Rectangular work envelope (B) Cylindrical work envelope (C) Spherical or hemispherical work envelope (D) None of the above
Last Answer : C
Description : Abrupt uplift and gentle subsidence are indicative of: (A) Hat microatoll (B) Hemispherical coral head (C) Cup microatoll (D) Cylindrical coral head
Last Answer : (C) Cup microatoll
Description : A uniform thin rod of mass `m` and length `R` is placed normally on surface of earth as shown. The mass of earth is `M` and its radius `R`. Then the m
Last Answer : A uniform thin rod of mass `m` and length `R` is placed normally on surface of earth as shown. The mass of earth ... 2GMm)/R^(2)` D. `(4 GMm)/R^(2)`
Description : A charged particle (charge `q`) is moving in a circle of radius `R` with unifrom speed `v`. The associated magnetic moment `mu` is given by
Last Answer : A charged particle (charge `q`) is moving in a circle of radius `R` with unifrom speed `v`. The associated magnetic ... . `1/2 aqR` D. `1/2 q^(2)vR`
Description : Root and face bends from an 8mm thick butt weld require testing. The specimens are cut to 20mm wide. The code calls for a 4t bend. Which of the following rollers should be selected for the testing? a) 50mm radius b) 50mdiameter c) 32mm radius d) 32mm diameter
Last Answer : d) 32mm diameter
Description : The human lens: a. is innervated by the ophthalmic nerve b. has a uniform refractive index c. has a large radius of curvature anteriorly than posteriorly d. stops growing after birth
Last Answer : has a large radius of curvature anteriorly than posteriorly
Description : The radius of a hemispherical balloon increases from 6 cm to 12 cm as air is being pumped into it. -Maths 9th
Last Answer : NEED ANSWER
Last Answer : Find the ratios of the surface areas of the balloon in the two cases.
Description : A hemispherical bowl is made of steel 0.5 cm thick. The inside radius of the bowl is 4 cm. What is the volume of steel used in making the bowl ? -Maths 9th
Last Answer : answer:
Description : Assertion (A) :Sunlight reaches us without dispersion in the form of white light and not as a component. Reason(R) : Dispersion takes place due to variation of refractive index for different wavelength but in vaccum the speed of ... of A. (c) A is true but R is false. (d) A is false but R is true.
Last Answer : (a) Both A and R are true and R is the correct explanation of A.
Description : According to the Snell's law if an electromagnetic wave is incident in a medium (refractive index n1) on another medium (refractive index m2); (A) The angle of incidence is equal to the angle of refraction (B) The angle of ... r) is given by sin i (C) Both (a) and (b) (D) Neither (a) nor (b)
Last Answer : Answer: Option B
Description : I live Q. I live in an old apartment building without grou in an old apartment building without grounded elect nded electrical outlets and I rical outlets and I cannot place a cannot place a ground rod outside in the Earth. What can I do?
Last Answer : If you don't mind a you don't mind a wire running through your apartmen wire running through your apartment, you could conn t, you could connect your Earthing ect your Earthing product to the cold ... Earthing mat in your office or in your office or place of work if place of work if practical.
Description : The radii of curvature of each surface of a convex lens is `20 cm` and the refractive index of the material of the lens is `3//2` (i) Calculate its fo
Last Answer : The radii of curvature of each surface of a convex lens is `20 cm` and the refractive index of the ... What happens if the lens is cut along `CD` ?
Description : A convex surface of radiys of curvature 20 cm separates air from glass of refractive index 1.5. Find the position and the nature of the image of a sma
Last Answer : A convex surface of radiys of curvature 20 cm separates air from glass of refractive index 1.5. Find ... at 50 cm in front of the convex surface.
Description : Pick out the extensive property out of the following. (A) Surface tension (B) Free energy (C) Specific heat (D) Refractive index
Last Answer : (B) Free energy
Description : The intensive properties are (A) Molar volume, density, viscosity and boiling point (B) Refractive index and surface tension (C) Both (A) and (B) (D) None of these
Last Answer : (C) Both (A) and (B)
Description : The angular momentum J of the electron in a hydrogen atom is proportional to `n^(th)` power of r (radius of the orbit) where n is :-
Last Answer : The angular momentum J of the electron in a hydrogen atom is proportional to `n^(th)` power of r (radius of the orbit ... B. `-1` C. `(1)/(2)` D. None
Description : A circular current carrying coil has a radius R. The distance from the centre of the coil on the axis where the magnetic induction will be `(1//8)^(th
Last Answer : A circular current carrying coil has a radius R. The distance from the centre of the coil on the axis where the ... 2//sqrt(3))R` D. `R//2sqrt(3)`
Description : A small object is 2 cm below the concave meniscus of water in a test tube . The radius of the meniscus is 5mm and `mu` for water is `4//3`. Find the n
Last Answer : A small object is 2 cm below the concave meniscus of water in a test tube . The radius of the ... /3`. Find the nature and position of the image.
Description : cylindrical rod subjected to a tensile strain within the elastic limit undergoes a volume change. If the volume strain is equal to half the tensile strain, then the Poisson's ratio of the rod is (A) 0 (B) 0.33 (C) 0.44 (D) 0.25
Last Answer : Option C
Description : A hemispherical bowl has its external diameter equal to 10 cm and its thickness is 1 cm. What is the whole surface area of the bowl ? -Maths 9th
Last Answer : External radius of hemispherical bowl = 5 cm Internal radius of the bowl = (5 – 1) cm = 4 cm Surface area of external portion = 2π(5)2 = 50 p sq. cm Surface area of internal portion = 2π(4)2 = ... = 91π sq. cm = (91×227)(91×227) sq. cm = 13 × 22 sq. cm = 286 cm2
Description : A double convex lens has radii 20 cm. The index of refraction of glass is 1.5. Compute the focal length of this lens in air and when immersed in carbo
Last Answer : A double convex lens has radii 20 cm. The index of refraction of glass is 1.5. Compute ... immersed in carbon disulphide of refractive index 1.63.
Description : Coherent light of a single frequency passes through a double slit with a separation d, to produce a pattern on a screen as distance D from the slits. What would cause the separation between adjacent ... d between the slits C. increase the distance D. increase the frequency of the incident light
Last Answer : B. increase the separation d between the slits
Description : When electrical cables penetrate watertight bulkheads, _______________. A. they should be grounded on either side of the bulkhead B. they must be bent to a radius of six diameters C. a watertight stuffing tube capable of accepting packing should be employed D. they should be secured by a clamp
Last Answer : Answer: C
Description : In a partnership P invests 2/6 th of the capital for 2/3rd of the time, Q invests 3/5th of the capital for 1/3rd of the time and R invests for 2/5th of the capital for 3/4th of the time. Out of the ... 64375at the end of the year, find R's share in the profit A) 27854. B) 23000. C) 26740. D) 25784
Last Answer : Answer: C) Ratio of their profits (2/6*2/3)*12: (3/5*1/3)*12: (2/5*3/4) *12 =40:36:54 R’s share =64375*54/130 =Rs.26740
Description : A long iron rod initially at a temperature of 20°C has one end dipped in boiling water (100°C) at time, t = 0. The curved surface of the rod is insulated so that heat conduction is one dimensional in the axial direction. The ... = 283 s (B) t = 356 s (C) t = 400 s (D) t = 800 s
Last Answer : (D) t = 800 s
Description : What is the refractive index of water medium ?
Last Answer : Refractive index through water is 1.33 .
Description : What is the refractive index of light in water ?
Last Answer : The refractive index of light in water is 1.33
Description : What is the refractive index of water ?
Last Answer : The refractive index of water is 1.33
Description : The two surfaces of a double concave lens are of curvature 10 cm and 40 cm. Find the focal length of the lens in water. The refractive index of water
Last Answer : The two surfaces of a double concave lens are of curvature 10 cm and 40 cm. Find the focal length of ... and that of the lens of the material is 3/2.
Description : A rectangular tank 8m deep is full of water. By how much does the bottom appear to be raised if the refractive index of water is `4//3`?
Last Answer : A rectangular tank 8m deep is full of water. By how much does the bottom appear to be raised if the refractive index of water is `4//3`?
Description : The speed of light in water is of that in air. What is the refractive index of water? (a) 3/4 (b) 4/3 (c) 1/4 (d) 0
Last Answer : Ans:(b)
Description : The refractive index of water will be a) 1 b) 2.66 c) 5 d) 1.33
Last Answer : d) 1.33
Description : Which of the following has the highest value of refractive index? (A) Brine (sea water) (B) Diamond (C) Distilled water (D) Glass
Last Answer : (B) Diamond
Description : The refractive index of the ocean water: (A) Increases with salinity (B) Increases with temperature (C) Decreases with salinity (D) Decreases with temperature
Last Answer : Answer: Option A
Description : A plano-convex lens `(mu = 1.5)` has a curved surface of radiys 15 cm. what is its focal length ?
Last Answer : A plano-convex lens `(mu = 1.5)` has a curved surface of radiys 15 cm. what is its focal length ?