Recent questions tagged cbsc

What type of lens is an air bubble inside water ?

asked Oct 11, 2017 by priyanka.c

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Name the instrument used by the opticians to measure the power of the lens directly

asked Oct 11, 2017 by priyanka.c

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An object 60 cm from a lens gives a virtual image at a distance of 20 cm in front of the lens. Is this lens converging or diverging ?

asked Oct 11, 2017 by priyanka.c

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An optically denser medium should posses greater mass density than an optically rarer medium. Is this statement true or false ?

asked Oct 11, 2017 by priyanka.c

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The main constituent of petroleum gas is

asked Oct 10, 2017 by priyanka.c

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U-235 content in natural uranium is

asked Oct 10, 2017 by priyanka.c

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One unified atomic mass is equivalent to

asked Oct 10, 2017 by priyanka.c

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Which of the statement is not correct

asked Oct 10, 2017 by priyanka.c

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Choose the correct option : The magnetic field inside a long solenoid carrying current is

asked Oct 10, 2017 by priyanka.c

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Is $R_s$ is the equivalent resistance of n resistances in series and $R_p$ is the equivalent resistance of n resistances in parallel then $\frac{R_s}{R_p}$ is

asked Oct 10, 2017 by priyanka.c

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Read the following passage and answer the question given below A parallel circuit divides the current in various components (appliances) and each component can draw current as per its appropriate operation. Separate on/off switch can be put with each component in parallel circuit. Moreover, total resistance in parallel circuit arrangement decreases and hence a stronger current can be drawn from a voltage source. In parallel combination, the equivalent resistance is lesser than the least of all the resistance. Connecting a number of resistors in parallel is like providing an equal number of paths, for the electron flow which results in a decrease in resistance. Question : Two resistors of different resistances are to be connected to a battery so as to obtain a minimum current, then the mode of connecting the resistances is

asked Oct 10, 2017 by priyanka.c

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Read the following passage and answer the question below A parallel circuit divides the current in various components (appliances) and each component can draw current as per it appropriate operation. Separate on/off switch can be put with each component in parallel circuit. Moreover, total resistance in parallel circuit arrangement decreases and hence a stronger current can be drawn from a voltage source. In parallel combination, the equivalent resistance is lesser than than the least of all the resistance. Connecting a number of resistors in parallel is like providing an equal number of paths, for the electron flow which results in a decrease in resistance. Question : A domestic circuit is always connected in ___________ so that the current supply is not disrupted even if one of the circuit goes off

asked Oct 6, 2017 by priyanka.c

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During sunset the sun appears reddish in colour because of

asked Oct 6, 2017 by priyanka.c

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A convex mirror used for rear view an automobile has radius of curvature of 3m. If a bus is located at 6m from the mirror, then the nature of this image is

asked Oct 6, 2017 by priyanka.c

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A dentist uses this mirror

asked Oct 6, 2017 by priyanka.c

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A mirror which can give real as well as virtual image is

asked Oct 5, 2017 by priyanka.c

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Which type of lens have negative power?

asked Oct 5, 2017 by priyanka.c

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For the same angle of incidence of $45 {\circ}$ the refraction angle in three transparent media A, B and C are $25^{\circ}, 30^{\circ} $ and $35^{\circ}$ respectively. In which medium is the speed of light minimum and in which medium maximum?

asked Oct 5, 2017 by priyanka.c

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Vitreous humor is the liquid which fills the space between

asked Oct 5, 2017 by priyanka.c

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A typical solar cell can produce electricity equal to

asked Sep 20, 2017 by priyanka.c

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Which of these is not a green house gas?

asked Sep 20, 2017 by priyanka.c

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_________ rods play an important roles as an absorbant in a nuclear reactor

asked Sep 20, 2017 by priyanka.c

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To convert ocean thermal energy into electricity, it is necessary that a difference of more than _____ between the surface waters and water depths of 1000m is required.

asked Sep 20, 2017 by priyanka.c

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An alternating current has a frequency has a frequency of 50Hz. How many times does it change its direction in one direction?

asked Sep 20, 2017 by priyanka.c

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If a conductor moves ______ to a magnetic field, an induced emf appears across its ends.

asked Sep 20, 2017 by priyanka.c

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A moving charge experiences a force in a magnetic field except when it is moving _____ to the magnetic field

asked Sep 20, 2017 by priyanka.c

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If the length of a conductor is resistance R is doubled, what will be its new resistance?

asked Sep 20, 2017 by priyanka.c

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What is the electric potential of a charge at infinity?

asked Sep 20, 2017 by priyanka.c

1 answer