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CBSE Questions

Total Questions 9982
35) If a 12V battery is connected to the arrangement of resistance given alongside ,calculate a) total effective resistance of the arrangEment b) the total current flowing in the circuit
34) A wire of resistance 10? is bent in the form of closed circle.What is the effective resistance between two points at ends of any diameter of circle.
15) A 60W eletric lamp gives off energy in the form of light at the rate of 7.5J/sec .What perentage of energy does the lamp transform into light energy ?
10) A heater coil is rated 100W , 200V .If is cut into two identical parts. Both parts are connected together in parallel to the same source of 200V. Calculate the energy liberated per second in the new combination.
1) A heater joined in parallel with a 60W buld is connected to the mains . If the bulb is replaced by a 100W bulb will the rate of the heat produced by the heater remain same, increase or decrease.
how does current flow through a solenoid when a magnet is moved inside it?
A bullect of mass 20gm moving with a speed of 120m/s enters a heavy wooden block and is stopped after a distance of 1.2m.What is the average resistive force?
A rectangular block of mass 25kg is pulled forward by a man with a force of 50N.Find the acceleration on the block a.When it is pulled horizotally{Neglect friction} b.When the string tied to the block makes an angle 30 degree with the horizontal. In the above question determine the reaction acting on the body by the floor in each case?
A rectangular block of mass 25kg is pulled forward by a man with a force of 50N.Find the acceleration on the block a.When it is pulled horizotally{Neglect friction} b.When the string tied to the block makes an angle 30 degree with the horizontal.
Two forces 40N and 60N are acting on a body of mass 5kg.If 40N is along positive x direction and 60N along y direction,find the resultant force and acceleration on the body?
why protons attract each other inside a nucleus?
why gravity is a waek force?
where is Romania?
Which country is known as "the country of roses"?
what is the shape of milky way galaxy
why there is no rain in rajasthan ?
Find the angle between the hour hand and minute hand of a clock when the time is 5:50?
information on national sports day
what will happen if we drink liquid nitrogen
WHAT IS FILTRATION