Recent questions tagged cbsc

An element X forms an oxide XO3 What is the valency of X?

asked Sep 18, 2017 by meena.p

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Read the passage below and answer the following question below When the direction of relative motion between the magnet and the coil is reversed i.e; instead of bringing the magnet and the coil towards each other, if they are taken away from each other, the direction of deflection in the galvanometer (i.e; induced current in the coil) is also reversed. It is due to the reason that when we being the magnet and the coil closer to each other, the magnetic flux linked with the coil increases whereas when these are moved away from each other, the magnetic flux linked with the coil decreases. Thus it is the change (whether an increase or a decrease) in magnetic flux in the coil which induces current in the coil. Increasing magnetic flux induces current in one direction whereas decreasing magnetic flux induces current in the opposite direction. Question : 1. Increase in the magnetic flux increases the induced current 2. Decrease in the flux decreases the induced current

asked Sep 18, 2017 by priyanka.c

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The number of electrons and neutrons of an element is 18 and 20 respectively. Its mass number is -

asked Sep 18, 2017 by meena.p

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Read the passage below and answer the following question below When the direction of relative motion between the magnet and the coil is reversed i.e; instead of bringing the magnet and the coil towards each other, if they are taken away from each other, the direction of deflection in the galvanometer (i.e; induced current in the coil) is also reversed. It is due to the reason that when we being the magnet and the coil closer to each other, the magnetic flux linked with the coil increases whereas when these are moved away from each other, the magnetic flux linked with the coil decreases. Thus it is the change (whether an increase or a decrease) in magnetic flux in the coil which induces current in the coil. Increasing magnetic flux induces current in one direction whereas decreasing magnetic flux induces current in the opposite direction. Question : What is the factor which induces the current in the coil?

asked Sep 18, 2017 by priyanka.c

1 answer

In an experiment to study the dependence of current on potential difference across a resistor a student obtained graph as shown in fig: The value of the resistor is

asked Sep 18, 2017 by priyanka.c

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Read the following statement and mark the correct option 1. Resistivity of a conductor depens on the nature of the material of the conductor 2. Resistance of a conductor is inversely proportional to its length

asked Sep 18, 2017 by priyanka.c

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Parallel rays from the top of a distant object incident on a cave mirror from an image on the screen. The diagram correctly showing the image of the object on the screen is

asked Sep 18, 2017 by priyanka.c

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What is the value of focal length of a plane mirror?

asked Sep 18, 2017 by priyanka.c

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What does the negative magnification imply?

asked Sep 18, 2017 by priyanka.c

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The percentage of solar energy that strikes the periphery of the earth trapped by the earth is

asked Sep 17, 2017 by priyanka.c

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Energy released during the fission of 1kg of U-235 is equivalent to energy obtained from burning coal weighing

asked Sep 17, 2017 by priyanka.c

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In a voltmeter there are 20 divisions between the 0 mark and 0.5 mark. The least count of the voltmeter is

asked Sep 17, 2017 by priyanka.c

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A device which is used to measure current, voltage and resistance is

asked Sep 17, 2017 by priyanka.c

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The potential difference between the points A and B of the circuit as shown in the fig is

asked Sep 17, 2017 by priyanka.c

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The resistivity of a wire depends upon its

asked Sep 17, 2017 by priyanka.c

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Two wires A and B are made of copper. Both wires are 1m long but wire A is 1mm thick and wire B is 2 mm thick. The resistivity is

asked Sep 17, 2017 by priyanka.c

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Induced current flows through a coil

asked Sep 17, 2017 by priyanka.c

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When a fuse is rated 6A. It means,

asked Sep 17, 2017 by priyanka.c

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Which of the following properties of a proton can change while it moves freely in a magnetic field?

asked Sep 17, 2017 by priyanka.c

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On the basis of their experiment to trace the path of a ray of light passing through a rectangular glass slab four students arrived at the following interpretation:

asked Sep 17, 2017 by priyanka.c

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A student determines the focal length of a device X, by focusing the image of a far off object on the screen positioned as shown in the figure. The device X is

asked Sep 17, 2017 by priyanka.c

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A student obtains a blurred image of an object on a screen by using a concave mirror. In order to obtain a sharp image on the screen, he will have to shift the mirror

asked Sep 17, 2017 by priyanka.c

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The focal length of a lens of power -2.0D. What type of lens is this?

asked Sep 17, 2017 by priyanka.c

1 answer