Recent questions tagged class 10

The main constituents of biogas are

asked Oct 22, 2017 by priyanka.c

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The function of a galvanometer is

asked Oct 22, 2017 by priyanka.c

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What is the force exerted by a magnetic field on a stationary charged particle?

asked Oct 22, 2017 by priyanka.c

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The magnitude of the magnetic field

asked Oct 22, 2017 by priyanka.c

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The slope of the V-I graph determines

asked Oct 22, 2017 by priyanka.c

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Read the given passage below and answer the question When a conductor AB is connected across the terminals of a cell, free electrons begin to drift or move from its end B (connected to the negative terminal of the cell). The current constituted by flowing electrons is called electronic current. Clearly the direction of electronic current is from negative terminal to positive terminal. By convention the direction of motion of positive charges is taken as the direction of electric current. It is from positive terminal to negative terminal. As the electrons are negatively charged, the direction of conventional current in an electric circuit is taken as opposite to the direction of the flow of electrons Which of the following statement are not correct : 1) Both electronic current and conventional current are the same 2) Electronic current and conventional current are opposite 3) Conventional current is from positive terminal to negative terminal 4) Electronic current is from positive terminal to negative terminal

asked Oct 22, 2017 by priyanka.c

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Read the above passage and answer the questions below When a conductor AB is connected across the terminals of a cell, free electrons begin to drift or move from its end B (connected to the negative terminal of the cell). The current constituted by flowing electrons is called electronic current. Clearly the direction of electronic current is from negative terminal to positive terminal. By convention the direction of motion of positive charges is taken as the direction of electric current. It is from positive terminal to negative terminal. As the electrons are negatively charged, the direction of conventional current in an electric circuit is taken as opposite to the direction of the flow of electrons QUESTION : The electronic current

asked Oct 22, 2017 by priyanka.c

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The efficiency of an electric device is

asked Oct 22, 2017 by priyanka.c

1 answer

What is yellow spot in human eye?

asked Oct 22, 2017 by priyanka.c

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Tyndal effect occurs when

asked Oct 22, 2017 by priyanka.c

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Bifocal lenses are prescribed for persons suffering from

asked Oct 22, 2017 by priyanka.c

1 answer

The apparent depth of an object at the bottom of the tank filled with a liquid of refractive index 1.3 is 7.7 cm. What is the actual depth of the liquid in the tank?

asked Oct 22, 2017 by priyanka.c

2 answers

The apparent depth of an object at the bottom of the tank filled with a liquid of refractive index 1.3 is 7.7 cm. What is the actual depth of the liquid in the tank?

asked Oct 22, 2017 by priyanka.c

1 answer

Refractive index depends upon (1) Nature of the medium (2)Wavelength of the light (3) Temperature (4)Angle of incidence

asked Oct 22, 2017 by priyanka.c

1 answer

Relation between f and R is

asked Oct 22, 2017 by priyanka.c

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The power of a lens is given as +2D, then its focal length is

asked Oct 22, 2017 by priyanka.c

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Read the following passage below and answer the given question Some of the conventional sources of energy have poor efficiency and produce a lot of smoke because of incomplete combustion. A few example are wood, animal dung, agricultural wastes etc; Wood has poor efficiency because only 8% of the wood is utilized as fuel. This results in incomplete combustion. Also, it produces gases like carbon di oxide which is hazardous to our health. Animal dung when mixed with mud and made in the form of cakes,which are then dried and burnt are also used for domestic purpose. As it burns, it produces a lot of smoke and hence results in air pollution. Agricultural wastes like sugarcane are burnt for use in industries. This is more preferable for biogas plants. QUESTION : Animal dung and agricultural waste are preferable for

asked Oct 17, 2017 by priyanka.c

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Read the following passage and answer the question given below Some of the conventional sources of energy have poor efficiency and produce a lot of smoke because of incomplete combustion. A few examples are wood, animal dung, agricultural wastes, etc; Wood has poor efficiency because only 8% of the wood is utilized as fuel. The results in incomplete combustion. Also, it produces gases like carbon di oxide which is hazardous to our health. Animal dung when mixed with mud and made in the form of cakes, which are then dried and burnt are also used for domestic purpose. As it burns, it produces a lot of smoke and hence results in air pollution. Agricultural wastes lie sugarcane are burnt for use in industries. This is more preferable for biogas plants. QUESTION : The smoke which is produced by the conventional source is due to

asked Oct 17, 2017 by priyanka.c

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Two identical prisms A'B'C' are given. Which of the following placements will give maximum dispersion ?

asked Oct 17, 2017 by priyanka.c

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A red rose when seen through a green filter will appear

asked Oct 17, 2017 by priyanka.c

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The angle between two refracting faces of a prism is known as

asked Oct 17, 2017 by priyanka.c

1 answer

Which of the following correctly represents the variable of 1/u versus 1/v for a concave mirror?

asked Oct 17, 2017 by priyanka.c

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The magnification of a mirror in the case of a virtual and erect image is

asked Oct 17, 2017 by priyanka.c

1 answer

Which of the following figures correctly depicts the reflection of a ray of light on a spherical mirror?

asked Oct 17, 2017 by priyanka.c

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Air is not visible because it

asked Oct 17, 2017 by priyanka.c

1 answer

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

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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

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Which of the following statements are correct? 1. The magnetic lines of force are always continuous loops, so they are endless. 2. The lines of force always starts from the south pole to north pole 3. Soft iron core is generally not preferred for solenoid 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 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. 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 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. Question : The scattering of light depends on (1) wavelength of light (2) frequency of light (3) molecules of the atmosphere (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

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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

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

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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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