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Recent questions tagged science

An electric motor operates on a 50V supply and draws a current of 12 A. If the motor yields a mechanical power of 300 W, what is the percentage efficiency of the motor?

asked Oct 17, 2017 by priyanka.c

1 answer

Calculate the current in a wire if a change of 2000 coulomb flows through it in 10 minutes

asked Oct 17, 2017 by priyanka.c

1 answer

The metal which has the lowest resistivity is

asked Oct 17, 2017 by priyanka.c

0 answers

A charged body at rest produces

asked Oct 17, 2017 by priyanka.c

1 answer

In which wire in an AC circuit is the switch introduced to operate the lights?

asked Oct 17, 2017 by priyanka.c

0 answers

Which of the following statements are correct? <br><br> 1. The magnetic lines of force are always continuous loops, so they are endless.<br> 2. The lines of force always starts from the south pole to north pole <br> 3. Soft iron core is generally not preferred for solenoid<br> 4. Force of the moving charge is maximum when it moves perpendicular to the direction pf the magnetic field.

asked Oct 17, 2017 by priyanka.c

1 answer

The main constituent of LPG is

asked Oct 11, 2017 by priyanka.c

1 answer

What type of solar cells can convert energy from both the visible as well as infrared radiation into electricity?

asked Oct 11, 2017 by priyanka.c

1 answer

The rule which determines the polarity of a circular current loop is

asked Oct 11, 2017 by priyanka.c

1 answer

The material used for making electro magnets is

asked Oct 11, 2017 by priyanka.c

1 answer

An electric geyser has ratings 1000W, 220V marked on it. What should be the minimum rating in whole number of a fuse wire, that may be required for safe use with this geyser ?

asked Oct 11, 2017 by priyanka.c

1 answer

An electric bulb is connected to a 220V generator. The current is 0.50 A. What is the power of the bulb ?

asked Oct 11, 2017 by priyanka.c

1 answer

Read the passage below and answer the question given below <br><br> The blue colour of the sky is due to the scattering of the sunlight by the molecules of the atmosphere. The molecules of air, such as $N_2$ and $O_2$ have sizes smaller than the wavelength of visible light. As sunlight passes through the atmosphere these molecules absorb some amount of sunlight and re-emit it. They scatter blue light of shorter wavelength more strongly than red light of stronger wavelength. When we look at the sky scattered light enters our eyes and this light contains blue light in large proportion. That is why the sky appears blue. <br><br> QUESTION : The colour of the sky in the absence of the atmosphere is

asked Oct 11, 2017 by priyanka.c

1 answer

Read the passage below and answer the question given below <br><br> The blue colour of the sky is due to the scattering of the sunlight by the molecules of the atmosphere. The molecules of air, such as $N_2$ and $O_2$ have sizes smaller than the wavelength of visible light. As sunlight passes through the atmosphere these molecules absorb some amount of sunlight and re-emit it. They scatter blue light of shorter wavelength more strongly than red light of stronger wavelength. When we look at the sky scattered light enters our eyes and this light contains blue light in large proportion. That is why the sky appears blue. <br><br> Question : The scattering of light depends on <br> (1) wavelength of light <br> (2) frequency of light <br> (3) molecules of the atmosphere <br> (4) medium

asked Oct 11, 2017 by priyanka.c

1 answer

Tyndall effect is a phenomenon of

asked Oct 11, 2017 by priyanka.c

1 answer

The light sensitive part of the eye is

asked Oct 11, 2017 by priyanka.c

1 answer

Bifocal lenses are used by people who suffer from

asked Oct 11, 2017 by priyanka.c

1 answer

What type of lens is an air bubble inside water ?

asked Oct 11, 2017 by priyanka.c

1 answer

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

asked Oct 11, 2017 by priyanka.c

1 answer

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

1 answer

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

1 answer

The main constituent of petroleum gas is

asked Oct 10, 2017 by priyanka.c

1 answer

U-235 content in natural uranium is

asked Oct 10, 2017 by priyanka.c

0 answers

One unified atomic mass is equivalent to

asked Oct 10, 2017 by priyanka.c

0 answers

Which of the statement is not correct

asked Oct 10, 2017 by priyanka.c

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Choose the correct option : <br> 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

0 answers

Read the following passage and answer the question given below <br><br> 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. <br><br> 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

0 answers

Read the following passage and answer the question below <br><br> 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. <br><br> 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

0 answers

During sunset the sun appears reddish in colour because of

asked Oct 6, 2017 by priyanka.c

0 answers

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

0 answers

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

1 answer

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

1 answer

Vitreous humor is the liquid which fills the space between

asked Oct 5, 2017 by priyanka.c

0 answers

A typical solar cell can produce electricity equal to

asked Sep 20, 2017 by priyanka.c

1 answer

Which of these is not a green house gas?

asked Sep 20, 2017 by priyanka.c

0 answers

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

asked Sep 20, 2017 by priyanka.c

1 answer

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

1 answer

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

1 answer

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

asked Sep 20, 2017 by priyanka.c

1 answer

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

1 answer

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

asked Sep 20, 2017 by priyanka.c

1 answer

What is the electric potential of a charge at infinity?

asked Sep 20, 2017 by priyanka.c

1 answer

Read the passage below and answer the following question <br><br> The phenomenon of splitting of white light into its component colours on passing through a refracting medium such a glass prism is called dispersion of light. The pattern obtained on the screen is called spectrum. <br><br> Cause for dispersion of light : Light rays of different colours travel with the same speed in vaccum. But in a refracting media like glss, water, etc; lights of different colours travel with different speeds. The speed of violet colour is the least while the speed of the red is the largest in glass. Hence the violet colour is deviated the most and the red colour the least. The other colur indigo, blue, green, yellow and orange are deviated by intermediate angles. <br><br> Question : The refractive index for violet is what is the electric charge

asked Sep 20, 2017 by priyanka.c

1 answer

Read the passage and answer the question given below <br><br> The phenomenon of splitting of which light into its component colour on passing through a refraction medium such as a glass prism is called dispersion of light. The pattern obtained on the screen is called spectrum. <br><br> Cause for dispersion of light: Light rays of different colours travel with the same speed in vaccum. But in a refracting media like glass, water etc; light of different colours travel with different speeds. The speed of violet colour is the least while the speed of the red is the largest in glass. Hence the violet colour is deviate the most and the red colour the least. The other colours indigo, blue, green, yellow and orange are deviated by intermediate angle. <br><br> Question : Dispersion of light through a medium is due to

asked Sep 19, 2017 by priyanka.c

0 answers

Why is the spokes of a rapidly rotating wheel cannot be distinguished?

asked Sep 19, 2017 by priyanka.c

1 answer

The power of a lens is -2.0D. What will be its focal length?

asked Sep 19, 2017 by priyanka.c

1 answer

An incident ray makes an angle of $25^{\circ}$ with the surface of a plane mirror. What will be the angle of reflection?

asked Sep 19, 2017 by priyanka.c

1 answer

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