
an electric bulb rated 50W at 100V is used in a circuit having a 200V supply. What resistance R must be put in series with the bulb so that then bulb delivers 500W? ...

shadow is formed by ______________ objects transparent translucent both of them none of these Your Answer b Correct Answer d How can the answer be none of them ? Transculent objects form a light shadow and transparent objects ...

You are waiting for your girlfriend at a coffee joint. She is as always late :P :D Do you pour cold milk first or do you wait before adding the cold milk? You know that she will be still late and it is shameful to stay in the ...

A cangaroo is capable of jumping to a height of 2.62m. Determine the takeoff speed of the kangaroo. ...

A car traveling at 22.4m/s skids to a stop in 2.55s. Determine the skidding distance of the car (assume uniform acceleration). ...

Which one of the following has variable valency? A. Chlorine B. Sulphur C. Iron D. Sodium Your answer : B Correct answer : C Why? ...

How many images will be formed when two mirrors are kept perpendicular?? 5 7 2 3 Your Answer d Correct Answer b how it is possible?MY WAS 3. 8)Find the distance traveled by light in 0.01 seconds in km 3X10^5 3X10^10 3X10^7 3X ...

If every action has an equal and opposite reaction, then how do we do anything?? ...

Why does the value of μ change for static friction and kinetic friction? Thanks to the person who can help me in advance. Thanks, Bye, Angikar ...

If I am Walking towards east,friction acting on me has a direction a.east b. west c. north d. none of the above your answer b correct answer a how? ...

1. A 8 kg block is at rest on a horizontal floor. If you push horizontally on the 8 kg block with a force of 20 N, it just starts to move. (a) What is the coefficient of static friction? (b) A 10.0 kg block is stacked on top ...

Why does a porter, carrying a heavy load on his back, bend forward? ...

I am stuck up with another question. During iceskating,why are no tracks left behind after the skier passes? Anyone care to help me out? Thanks in advance. I need it urgently,as my exam is on Tuesday. ...

A body of mass 10 kg is sliding on a frictionless surface with a velocity of 2,m{{s}^{1}} . The force required to keep it moving with a same velocity is ...

A force of 40N acts on 4cm2. What is value of pressure in N/m2? a)105 b)104 c)103 d)106 ...

The circumference of the front wheel of a cart is 30 ft long and that of the back wheel is 36 ft long. What is the distance travelled by the cart, when the front wheel has done five more revolutions than the rear wheel? 750π ...

Why is the value of μ greater in sliding friction than rolling friction? ...

Can rolling friction be ever static? ...

Why is static friction more than kinetic friction? Advance thanks to the person who can help me. Thanks, Bye, Angikar ...

If diagonal and area of rectangle are 25 m and 168 , then what is the length of the rectangle? 17m 31m 12m 24m ...

A regular hexagon is inscribed in a circle of radius r cms. What is the perimeter of the regular hexagon? 3r 6r r√72 9r ...

3)Calculate the current in a wire if 900 C of charge passes through it in 10 minutes. 2A 5A 10A None of these Your Answer d Correct Answer b A=C/t HERE C=900C AND t= 10*60s THEREFORE A=900/600A =1.5A THEN HOW MY ANSWER IS WRO ...

Which of the following figures has the largest area? I. A circle of radius II. An equilateral triangle whose sides each have length 4 III. A triangle whose sides have lengths 3, 4 and 5 I II III I and III ...

How does a tornado form? ...

Water is to be pumped to fill a tank of volume 30 kL at a height of 40m from the ground in 15 mins by a pump on the ground floor.What is the electric power consumed by the water pump?Efficiency of pump=30%.. Density of water= ...

a> a fish at a depth d below the water sees a bird flying at a height h above the ground at an apparent distance......??? b> a double convex lens , made of a material of refractive index μ is placed inside two liquids ...

1)Mark the truth: a.Earth is revolving around the Sun. b.Sun is revolving around the Earth. c.Depends on on the Frame of reference we are seeing the bodies from. d.All the above statements are wrong. Your Answer a Correct Ans ...

10)A galvanometer can be converted into an ammeter by connecting a high resistance in series connecting a low resistance in parallel connecting a low resistance in series \connecting a high resistance in parallel Your Answer ...

I'm stuck up with another question. Which part of the electromagnetic spectrum is used for : 1) Crystallography 2) Satellite communication In each case , mention the reason for using the particular electromagnetic rays select ...

Guys,I need some help regarding a question. Two ice cubes get stuck to each other when pressed together. Why? Can anyone answer this question for me? It's a bit urgent as my exam is on Tuesday. ...