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Recent questions tagged olympiad

Read the following statement and mark the correct option <br> 1. Resistivity of a conductor depens on the nature of the material of the conductor <br> 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 <br><br> 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. <br> 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. <br><br> When observing distant objects, the eye lens has

asked Sep 15, 2017 by priyanka.c

1 answer

Read the passage carefully and answer the question below <br><br> One of the remarkable properties of the eye is the ability of the eye to observe distinctly the objects situated at widely different distance from the eye. This property of the eye is called accommodation or power of accommodation of the eye. <br> 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 muscles 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 objects eye is in relaxed state. It is said to be unaccommodated. <br><br> The accommodation of the eye is due to the action of

asked Sep 15, 2017 by priyanka.c

1 answer

Which of the following statements is not correct? <br> 1) In a domestic electric circuits the live wire usually has red insulation <br> 2) The neutral wire has black insulation <br> 3) The earth wire has green insulation

asked Sep 15, 2017 by priyanka.c

1 answer

Which of the following instrument works on electromagnetic induction?

asked Sep 15, 2017 by priyanka.c

2 answers

The minimum wind velocity required to obtain useful energy with a wind mill is

asked Sep 15, 2017 by priyanka.c

1 answer

The maximum temperature attained in a concave reflector type solar cooker is

asked Sep 15, 2017 by priyanka.c

1 answer

How much current will be drawn by an electric heater from a 220V line, if the resistance of the heater is 50 ohms?

asked Sep 15, 2017 by priyanka.c

1 answer

The magnification of a plane mirror is +1. What does this signify?

asked Sep 15, 2017 by priyanka.c

1 answer

What is the unit for refractive index?

asked Sep 15, 2017 by priyanka.c

1 answer

______ is the commonly used material to manufacture solar cells

asked Sep 15, 2017 by priyanka.c

1 answer

______ is the source of energy in the sun and other planets

asked Sep 15, 2017 by priyanka.c

1 answer

Lignite, Anthracite and Bituminous are varieties of

asked Sep 15, 2017 by priyanka.c

1 answer

Which of the statement is true <br> (A) An AC can be changed to DC when required <br> (B) In India the frequency of AC is 60 Hertz <br> (C) The power wastage in AC transmission is high when compared to DC <br> (D) In an AC the direction is changed after a fixed interval

asked Sep 15, 2017 by priyanka.c

1 answer

The magnitude of induced current depends upn

asked Sep 15, 2017 by priyanka.c

1 answer

Read the following passage and answer below <br><br> Direction of force acting on a charge moving in a magnetic field <br><br> Since the direction of current is the same as that of the motion of a positive charge, the direction of force acting on it, when moving perpendicular to direction field is the same as that acting on a current carrying conductor placed perpendicular to the direction of magnetic field. The direction of this force is given by Flemming's left-hand rule. Obviously the force acting on a negative charge moving in a direction perpendicular to the field opposite to that acting on a positive charge. <br><br> Question: When both the magnetic field and the electric field are kept in the same direction, as electron which is moving in this field will

asked Sep 15, 2017 by priyanka.c

1 answer

Read the following passage and answer below <br><br> Direction of force acting on a charge moving in a magnetic field <br><br> Since the direction of current is the same as that of the motion of a positive charge, the direction of force acting on it, when moving perpendicular to direction of magnetic field is the same as that acting on a current carrying conductor placed perpendicular to the direction of magnetic field. The direction of this force is given by Flemming's left-hand rule. Obviously the force acting on a negative charge moving in a direction perpendicular to the field opposite to that acting on a positive charge. <br> <br> Question : The force of an electron moving a magnetic field is

asked Sep 15, 2017 by priyanka.c

1 answer

An electric toaster has a rating of 155W 220V marked on it/ What should be the minimum ratio(in whole number) of the fuse wire that may be required for the safe use with this toaster?

asked Sep 14, 2017 by priyanka.c

1 answer

Two wires are made up of silver. Both wires are 2m long, but wire A is 2mm thick and wire B is 4mm thick. The resistivity is

asked Sep 14, 2017 by priyanka.c

1 answer

Rare gases are

asked Sep 14, 2017 by meena.p

1 answer

All of the following are trends in the periodic table, except:

asked Sep 14, 2017 by meena.p

1 answer

Which of the following is not a balanced equation?

asked Sep 14, 2017 by meena.p

1 answer

Monosaccharides (simple sugars) have

asked Sep 14, 2017 by meena.p

1 answer

Out of total amount of water available for human use is

asked Sep 14, 2017 by meena.p

1 answer

All of the following are diatomic molecules, except:

asked Sep 14, 2017 by meena.p

1 answer

A solution reacts with crushed egg-shells to give a gas that turns lime-water milky.The solution contains:

asked Sep 14, 2017 by meena.p

1 answer

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