Recent questions in Olympiad-Science

The product of equivalent weight and valency of an element is equal to _

asked Sep 18, 2017 by meena.p

3 answers

Which one of the following element is essential for construction is nuclear reactors?

asked Sep 18, 2017 by meena.p

1 answer

The chemical formula of caustic potash is

asked Sep 18, 2017 by meena.p

1 answer

Which is not true about the noble gases?

asked Sep 18, 2017 by meena.p

1 answer

Human bone does not contain

asked Sep 18, 2017 by meena.p

1 answer

The element with atomic number 14 is hard and forms acidic oxide and a covalent halide. To which of the following categories does the element belong?

asked Sep 18, 2017 by meena.p

1 answer

Which of the following does not belong to the same homologous series?

asked Sep 18, 2017 by meena.p

1 answer

The fission products obtained after the fission of $U_{235}$ is

asked Sep 18, 2017 by priyanka.c

1 answer

In the double displacement reaction between aqueous potassium iodide and aqueous lead nitrate, a yellow precipitate of lead iodide is formed. While performing the activity if lead nitrate is not available, which of the following can be used in place of lead nitrate?

asked Sep 18, 2017 by meena.p

1 answer

One Mev of energy is equivalent to

asked Sep 18, 2017 by priyanka.c

1 answer

The near point of a hypermetropic eye is 75 cm from the eye. What is the power of the lens required to enable him to read clearly a book at 25 cm from the eye?

asked Sep 18, 2017 by priyanka.c

1 answer

Which has greater resistance, a toaster of 1KW and an electric heater of 2KW?

asked Sep 18, 2017 by priyanka.c

1 answer

Which of the following reactions will not take place?

asked Sep 18, 2017 by meena.p

1 answer

The amount of charge that would flow in 2 hours through the element of an electric bulb drawing a current of 0.25 A is

asked Sep 18, 2017 by priyanka.c

1 answer

In Faraday's experiment when the magnet is stationary, there is

asked Sep 18, 2017 by priyanka.c

1 answer

A positively charged particle projected towards west is deflected towards north by a magnetic field. The direction of magnetic field is

asked Sep 18, 2017 by priyanka.c

1 answer

Which of the following metals is not attacked by the environment—

asked Sep 18, 2017 by meena.p

1 answer

The density of the gas is equal to

asked Sep 18, 2017 by meena.p

1 answer

The intensity of scattered light varies inversely as the $n^{th}$ power of wavelength of incident light where

asked Sep 18, 2017 by priyanka.c

1 answer

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

asked Sep 18, 2017 by meena.p

1 answer

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

1 answer

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

1 answer

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

1 answer

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

1 answer

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

1 answer

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

asked Sep 18, 2017 by priyanka.c

1 answer

What does the negative magnification imply?

asked Sep 18, 2017 by priyanka.c

1 answer

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

asked Sep 17, 2017 by priyanka.c

1 answer

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

1 answer

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

1 answer

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

asked Sep 17, 2017 by priyanka.c

1 answer

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

1 answer

The resistivity of a wire depends upon its

asked Sep 17, 2017 by priyanka.c

1 answer

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

1 answer

Induced current flows through a coil

asked Sep 17, 2017 by priyanka.c

1 answer

When a fuse is rated 6A. It means,

asked Sep 17, 2017 by priyanka.c

1 answer

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

1 answer

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

1 answer

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

1 answer

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

1 answer

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

To obtain magnified, inverted image in a concave mirror, object should be held

asked Sep 16, 2017 by priyanka.c

1 answer

In a fusion reaction the synthesis of triton is from

asked Sep 15, 2017 by priyanka.c

1 answer

What are the other two gases other than carbon dioxide that are given out during burning of fossil fuels and contribute towards acid rain

asked Sep 15, 2017 by priyanka.c

1 answer

Hydrogen is a

asked Sep 15, 2017 by priyanka.c

1 answer

On plugging the key, the voltmeter/ammeter (A) is likely to be damaged in the circuit shown in the figure

asked Sep 15, 2017 by priyanka.c

1 answer

Twinkling of the stars is due to

asked Sep 15, 2017 by priyanka.c

1 answer

The space between eye lens and retina contains a transparent jelly called

asked Sep 15, 2017 by priyanka.c

1 answer

Read the following passage carefully and answer the question below One of the remarkable properties of the eye is the ability of the eye to observe distinctly the objects suitable at widely different distances from the eye. This property of the eye is called accommodation or power of accommodation of the eye. The accommodation of the eye is due to the action of ciliary muscles holding the eye lens. For observing distance objects (say at infinity) the ciliary muscle are relaxed. The eye lens is thin and it has maximum focal length and minimum converging power. The image of the distance object is formed on the retina. Thus for observing distant object eye is in relaxed state. It is said to be unaccommodated. When observing distant objects, the eye lens has

asked Sep 15, 2017 by priyanka.c

1 answer

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