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2051.

(i) A man is standing between two vertical walls 680 m apart . He claps his hands and hears two distinct echoes after 0.9 second and 1.1 second respectively. What is the speed of sound in the air? (ii) A door is pushed , at a point whose distance from the hinges is 90 cm , with a force of 40 N. Calculate the moment of the force about the hiages.

Answer»

SOLUTION :(i) Velocity = `("Distance travelled by sound")/("Time TAKES")`
`v=(2D)/(t)`
`d_1=(vt_1)/2 and d_2-(vt_2)/2`
`d=V/2(t_1+t_2)`
`v=(2d)/(t_1+t_2)`
`=(2xx680)/(0.9+1.1)=(2xx680)/2=680"ms"^(-1)`
`v = 680 "ms"^(-1)`
(ii)The moment of a force M = `Fxxd`
`d=90 cm = 0.9m`
Hence, moment of the force `=40xx0.9=36` Nm
Discussion
2052.

Example of an amphoteric oxide is

Answer»

`Na_(2)O`
`MGO`
`Al_(2)O_(3)`
`CaO`

SOLUTION :`Al_(2)O_(3)`
Discussion
2053.

If magnification is greater than one diminished image will be obtained.

Answer»

SOLUTION :Correct STATEMENT- If magnification is GREATER than ONE enlarged image will be obtained.
Discussion
2054.

What is meant by colloid ?

Answer»

Solution :COLLOID is a microscopocally SMALL substance that is equally DISPERSED THROUGHT another material.
Example : Milk , Ice cream , muddy water , smoke
Discussion
2055.

What is the direction of magnetic field at a given point ?

Answer»

SOLUTION :The DIRECTION in whichN-poleof a SMALL COMPASS needleplaced at the pointsets itself.
Discussion
2056.

a) Why does an aqueous solution of an acid conduct electricity. b) How is plaster of paris prepared ? What reaction takes plaster place when its sets to a hard mass.

Answer»

Solution :a) The presence of hydrogen (`H^(+)`) or hydronium(`H_(3)O^(+)`) ions in the aqueous solution of an acid are responsible for CONDUCTING electricity
b) Plaster of Paris is prepared by heating gypsum to a temperature of `100^(@)C` the following reaction TAKES place :
`CaSO_(4). 2H_(2)O to CaSO_(4). (1)/(2)H_(2)O + 1 (1)/(2)H_(2)O`
On MIXING with water it converts to a hard MASS to form gypsum again i,e the reverse reaction takes place.
Discussion
2057.

A spring is kept compressed by a toy cart of mass 150 g.On releasing the cart.It moves with a speed of 0.2 ms^(-1) .Calculate the potential energy (elastic)of the spring .

Answer»

Solution :Given ,m=150 g =`150 XX 10^(-3) kg ,v=0.2 m ^(-1)` On releasing the CART,the spring tries to COME back to its uncompressed STATE by pushing the cart away.Thus the potential energy stored in the spring changes.into the kinetic energy of the cart.
Potential energy of spring U `=3xx10^(-3)J`
Discussion
2058.

Draw a concept map to show different methods of reproduction :

Answer»

SOLUTION :
Discussion
2059.

A singlehighlycoiled tubewherespermsare stored, getconcentratedand matureisknown as ________.

Answer»

EPIDIDYMIS
VASA EFFERENTIA
Vasa defferens
SEMINIFEROUS tubules

Solution :Epididymis
Discussion
2060.

What type of changes occurs in a home having chronically ill old person? How will you help to maintaing good atmosphere ?

Answer»

Solution :i. The CHANGES the occur in a home having a chronically ILL old person arre as follows.
a. Other mambers fo the house become more alert about health related issues.
b. They tend to maintain extereme cleanliness in the house.
c. The ambience in the house is stressed at every moment.
ii. In ORDER to maintain good atmocphere in such a situation one can do the FOLLOWING things :
a. Increase communication among the members of the family so as to keep everyone CONNECTED.
b. Take care that the needs of other members of the house are not neglected while dealing with the chronically ill old person.
c. Help by doing small chores like bringing medicines, etc.
Discussion
2061.

According to Avogadro's law equal volumes of all gases under same pressure have equal numbers of molecules.-

Answer»


ANSWER :1
Discussion
2062.

IRS

Answer»

SOLUTION :INDIAN REMOTE SENSING SATELLITE.
Discussion
2063.

A ___________is also known as fissile material.

Answer»

SOLUTION :FISSIONABLE MATERIAL
Discussion
2064.

Waterentersthe plant through stomata .

Answer»

RESPIRATION
PHOTOSYNTHESIS
EXCRETION
TRANSPIRATION

SOLUTION :transpiration
Discussion
2065.

State one advantage of AC over DC.

Answer»

SOLUTION :A.C. voltage can be STEPPED up and transmitted over long DISTANCES without MUCH loss of ENERGY.
Discussion
2066.

Two particles, each of mass m and speed u, travel in opposite directions along parallel lines separated by a distance d. Show that the vector angular momentum of the two particle system is the same whatever be the point about which the angular momentum is taken.

Answer»

Solution :Angular momentum, L = myr
Choose any axis say 'A'
Let at any GIVEN time distance between `m_1 & m_2 = L = L_1 + L_2`
About the axis 'A' both will ROTATE in same direction See FIG.

`therefore` total angular momentum
`L = L_1 +L_2 =muL_1 + muL_2 = mu (L_1 +L_2) = MUL`
about any new axis say B distance of `m_1` and `m_2` are say `L'_1 " and "L'_2` ltbtgt Total angular momentum
` L= muL'_1 + muL'_2`
or ` L = mu(L'_1 + L'_2) = mu L (because L'_1 +L'_2 =L) `
Hence , total angular momentum of the system is always constant .
Discussion
2067.

In refraction of light through a prism the light ray:

Answer»

suffers REFRACTION only at one face of the PRISM
emergest out from the prism in a DIRECTION parallel to the incident ray
bends at both the surface of the prism towards its base
bends at both the SURFACES of the prism OPPOSITE to its base.

Answer :C
Discussion
2068.

Give two examples of each to ionic and covalent compounds?

Answer»

SOLUTION :1) Ionic compounds EG : `NaCl, MgCl_2`
2) COVALENT compounds eg : `Cl_2, HCl`.
Discussion
2069.

How does combustion of fossil fuels cause greenhouse effect?

Answer»

Solution :When fossil FUELS are burnt, they RELEASE `co_(2)`and other greenhouse gases into the ATMOSPHERE. These trap heat in our atmosphere resulting in GLOBAL warming and hence cause greenhouse EFFECT.
Discussion
2070.

Read the paragraph and answer the questions given below it: Construction of a compound microscope : (1) A compound microscope consists of a metal tube fitted with two convex lenses at the two ends. These lenses are called the objective lens (the lens directed towards the object) and the eyepiece (the lens directed toward the eye). Both thhe lenses are small in size, but the cross section of the objective lens is less than that of the eyepiece. The objective lens has a short focal length. The focal length of the eyepiece is more than that of the objective lens. (2) The metal tube is mounted on a stand. The principle axes of the objective lens and the eyepiece are along the same line. The distance between the object and the objective lens can be changed with a screw. It is possible to change the distance between the objective lens and the eyepiece. Working : (1) The object to be observed is illuminated and placed in front of the objective lens, slightly beyond the focal length of hte objective lens. Its real, invertes and enlarged image is formed by the objective lens on the other side. (2) This intermediate image lies within the focal length of the eyepiece. It serves as an object for the oyepiece. The oyepiece works as a simple micrroscope. The final image is virtual, highly enlarged and inverted with respect to the original object. It can be formed at the minimum distance of distinict vision from the eyepiece. The final image is observed by keeping the oye close to the eyepice. Use: This microscope is uded to observe blood cells, microorganisms, sec. In a compound microscope, which lens which lens has greater focal length?

Answer»

SOLUTION :In a COMPOUND imicroscope, the eyepiece has GREATER FOCAL length.
Discussion
2071.

(b) Identify the block of element denoted by letter B and write its period number .

Answer»

Solution :The BLOCK of element DENOTED by letter B is the d-block and its CONFIGURATION is 4.
Discussion
2072.

Read the paragraph and answer the questions given below it: Construction of a compound microscope : (1) A compound microscope consists of a metal tube fitted with two convex lenses at the two ends. These lenses are called the objective lens (the lens directed towards the object) and the eyepiece (the lens directed toward the eye). Both thhe lenses are small in size, but the cross section of the objective lens is less than that of the eyepiece. The objective lens has a short focal length. The focal length of the eyepiece is more than that of the objective lens. (2) The metal tube is mounted on a stand. The principle axes of the objective lens and the eyepiece are along the same line. The distance between the object and the objective lens can be changed with a screw. It is possible to change the distance between the objective lens and the eyepiece. Working : (1) The object to be observed is illuminated and placed in front of the objective lens, slightly beyond the focal length of hte objective lens. Its real, invertes and enlarged image is formed by the objective lens on the other side. (2) This intermediate image lies within the focal length of the eyepiece. It serves as an object for the oyepiece. The oyepiece works as a simple micrroscope. The final image is virtual, highly enlarged and inverted with respect to the original object. It can be formed at the minimum distance of distinict vision from the eyepiece. The final image is observed by keeping the oye close to the eyepice. Use: This microscope is uded to observe blood cells, microorganisms, sec. State which distance is adjusted to observe the object with a compound microscope.

Answer»

SOLUTION :To observe the object with a compound MICROSCOPE, the DISTANCE between the object and objective LENS is adjusted.
Discussion
2073.

In a hydro power plant :

Answer»

KINETIC ENERGY possessed by stored WATER is converted into electrical energy
electricity is EXTRACTED from water.
water is converted into steam to TURN turbines and produce electricity
potential energy possessed by stored water is converted into electricity.

Answer :D
Discussion
2074.

A fish 12 cm long is 5 cm under the water level. Its length when viewed vertically above will be

Answer»

12 cm
7 cm
5 cm
none of these

Solution :When viewed vertically, the LENGTH of fish will REMAIN the same i.e., 12 cm. However, its apparent DEPTH will CHANGE.
Discussion
2075.

Read the paragraph and answer the questions given below it: Construction of a compound microscope : (1) A compound microscope consists of a metal tube fitted with two convex lenses at the two ends. These lenses are called the objective lens (the lens directed towards the object) and the eyepiece (the lens directed toward the eye). Both thhe lenses are small in size, but the cross section of the objective lens is less than that of the eyepiece. The objective lens has a short focal length. The focal length of the eyepiece is more than that of the objective lens. (2) The metal tube is mounted on a stand. The principle axes of the objective lens and the eyepiece are along the same line. The distance between the object and the objective lens can be changed with a screw. It is possible to change the distance between the objective lens and the eyepiece. Working : (1) The object to be observed is illuminated and placed in front of the objective lens, slightly beyond the focal length of hte objective lens. Its real, invertes and enlarged image is formed by the objective lens on the other side. (2) This intermediate image lies within the focal length of the eyepiece. It serves as an object for the oyepiece. The oyepiece works as a simple micrroscope. The final image is virtual, highly enlarged and inverted with respect to the original object. It can be formed at the minimum distance of distinict vision from the eyepiece. The final image is observed by keeping the oye close to the eyepice. Use: This microscope is uded to observe blood cells, microorganisms, sec. Where fo you place the object to be observed with a compound microscope ?

Answer»

Solution :In a compound microscope, the OBJECT to be OBSERVED is PLACE in front of the objective lens, slightly beyond the focus of the objective lens.
Discussion
2076.

In the experiment on tracing the path of a ray of light passing through a rectangular glass slab, the correct setting of the protractor (D), for measuring the angle of incidence (angle I), and the angle of emergence (angle e) correspond, respectively, to diagrams :

Answer»

K and M
K and N
L and M
L and N

Solution :NA
Discussion
2077.

Read the paragraph and answer the questions given below it: Construction of a compound microscope : (1) A compound microscope consists of a metal tube fitted with two convex lenses at the two ends. These lenses are called the objective lens (the lens directed towards the object) and the eyepiece (the lens directed toward the eye). Both thhe lenses are small in size, but the cross section of the objective lens is less than that of the eyepiece. The objective lens has a short focal length. The focal length of the eyepiece is more than that of the objective lens. (2) The metal tube is mounted on a stand. The principle axes of the objective lens and the eyepiece are along the same line. The distance between the object and the objective lens can be changed with a screw. It is possible to change the distance between the objective lens and the eyepiece. Working : (1) The object to be observed is illuminated and placed in front of the objective lens, slightly beyond the focal length of hte objective lens. Its real, invertes and enlarged image is formed by the objective lens on the other side. (2) This intermediate image lies within the focal length of the eyepiece. It serves as an object for the oyepiece. The oyepiece works as a simple micrroscope. The final image is virtual, highly enlarged and inverted with respect to the original object. It can be formed at the minimum distance of distinict vision from the eyepiece. The final image is observed by keeping the oye close to the eyepice. Use: This microscope is uded to observe blood cells, microorganisms, sec. State the use of a compound microscope.

Answer»

Solution :A compound microscope is used to OBSERVE BLOOD CELLS, microoganisms, ETC.
Discussion
2078.

State Avogadro's law.

Answer»

Solution :Avogadro.s LAW : Equal volumes of all GASES under the same conditions of temperature and pressure contain an equal number of MOLECULES.
Applications of Avogadro.s law :
`**` It is used to determine the atomicity of gases.
`**` It is used to determine the atomicity of gases.
`**` It is helpful in determining the molecular formula of GASEOUS compounds.
`**` It gives the value of molar volume of gases at STP. Molar volume of a gas at STP = 22.4 litres.
`**` It explains Gay lussac.s law effectively.
Discussion
2079.

Read the paragraph and answer the questions given below it: Construction of a compound microscope : (1) A compound microscope consists of a metal tube fitted with two convex lenses at the two ends. These lenses are called the objective lens (the lens directed towards the object) and the eyepiece (the lens directed toward the eye). Both thhe lenses are small in size, but the cross section of the objective lens is less than that of the eyepiece. The objective lens has a short focal length. The focal length of the eyepiece is more than that of the objective lens. (2) The metal tube is mounted on a stand. The principle axes of the objective lens and the eyepiece are along the same line. The distance between the object and the objective lens can be changed with a screw. It is possible to change the distance between the objective lens and the eyepiece. Working : (1) The object to be observed is illuminated and placed in front of the objective lens, slightly beyond the focal length of hte objective lens. Its real, invertes and enlarged image is formed by the objective lens on the other side. (2) This intermediate image lies within the focal length of the eyepiece. It serves as an object for the oyepiece. The oyepiece works as a simple micrroscope. The final image is virtual, highly enlarged and inverted with respect to the original object. It can be formed at the minimum distance of distinict vision from the eyepiece. The final image is observed by keeping the oye close to the eyepice. Use: This microscope is uded to observe blood cells, microorganisms, sec. State the nature of the final image in a compound microscope relative to the object.

Answer»

SOLUTION :In a compound microscope, the final IMAGE is virtual, highly enlarged and inverted RELATIVE to the OBJECT.
Discussion
2080.

Pick the right combination of terms which has no fossil fuel.

Answer»

WIND, ocean and coal
Kerosene, wind and tide
Wind, WOOD, sun
PETROLEUM, wood, sun

Solution :Wind, wood, sun has no FOSSIL fuel. Coal, petroleum and kerosene are fossil fuels in the GIVEN list.
Discussion
2081.

Define reflection and refraction of light.

Answer»

SOLUTION :The bouncing back of rays of LIGHT from a polished and SHINY surface is called reflection of light. During reflection, light ray passing through a medium strikes the surface of an object and BOUNCES back to the same medium. Refraction of light refers to change in the direction of light as it travels from one medium to another. The change in direction happens due to change difference in speed of light in the two MEDIA.
Discussion
2082.

1-131 is used in the treatment of

Answer»

CANCER
SKIN disease
DISCASE in THYROID GLAND
tumour

Solution :discase in thyroid gland
Discussion
2083.

In which of the following sport the turningeffect of force used ?

Answer»

SWIMMING
Tennis
Cycling
HOCKEY

ANSWER :C
Discussion
2084.

For the measurement heat in body following one of these is used ..........

Answer»

thermometer
calorimeter
pressure gauge
MULTI meter

Solution :HEAT of a body can be MEASURED with the HELP of calorimeter.
Discussion
2085.

Decreased secretion of thyroid hormones in the children leads to………..

Answer»

myxoedema
tetany
cretinism
goitre

Answer :C
Discussion
2086.

What is a circuit diagram ?

Answer»

SOLUTION :A schematic DIAGRAM which represents the relative position and connectionof various circuit components, REPRESENTED by their ELECTRICAL symbols,is CALLED a circuit diagram.
Discussion
2087.

One word is incorrect in the statement . Change it to make the statement correct : Amphibians are warm blooded .

Answer»

SOLUTION :AMPHIBIANS are COLD - BLOODED. Or MAMMALS are warmblooded .
Discussion
2088.

Compare the power used in the 2 Omega resistor in each of the following circuits: (i) a 6V battery in series with 1 Omega and 2 Omega resistors, and (ii) a 4V battery in parallel with 12 Omega and 2Omega resistors.

Answer»

Solution :(i) When a `2 Omega` resistors a joined to a 6V battery in series with `1 Omega and 2 Omega` resistors, total resistance of the combination `R_s=2+1+2= 5 Omega`
`therefore` CURRENT in the CIRCUIT `I_1=(6V)/( 5 Omega)=1.2 A`
`therefore` Power used in the `2 Omega` resistors `P_1=I_1^2R=(1.2)^2 times 2=2.88W`
(ii) When `2 Omega` resistors is joined to a 4V battery in parallel with `12 Omega and 2 Omega` resistors, current flowing in `2 Omega` resistor is INDEPENDENT of the other resistors.
`therefore` Current flowing through `2 Omega` resistor `I_2=(4V)/(2 Omega)=2A`
`therefore` Power used in the `2 Omega` resistor `P_2=I_2^2 R=(2)^2 times 2=8W`
`therefore P_1/P_2=(2.88W)/(8W)=0.36:1`
Discussion
2089.

There are certain NGOs which motivate the general public to donate clothes, books, toys, stationary items, utensils, etc. to them. These NGOs further segregate and distribute these items to the needy. Answer the following questions based on the above information: (i) In your opinion what objective/objectives are fulfilled by this initiative? (ii) What values do they promote?

Answer»

Solution :(i) (a) Good initiative approach of reuse.
(b) Sensitising general public towards community.
(ii) Invoking social RESPONSIBILITY among citizens by contributing their share towards MUCH generous ACTS of society towards their under privileged FELLOWS.
Discussion
2090.

{:("1.Radio iron" (Fe^(59)), "(a) treatment of skin diseases"), ("2. Radio phosphorous" (I^(32)), "(b) smoke detector"), (3. "Radio gold" (Au^(198)), "(c) diagnose anaemia"),(4. "Isotope of Americium" (Am^(241)) , "(d) treatment of skin cancer"):}

Answer»

SOLUTION :1. (C) diagnose anaemia 2. (a) treatment of skin diseases 3. (d) treatment of skin cancer 4. (B) smoke detector
Discussion
2091.

What is the basic cause of atmospheric refraction?

Answer»

SOLUTION :The DIFFERENT layers of the atmosphere have different OPTICAL DENSITIES which is the basic reason for atmospheric refraction experienced by the sunlight
Discussion
2092.

A car runs on a circular track at a constant speed. The circular track has a radius of 100m. If the car takes 62.8 on each lap, its average speed is

Answer»

`20MS^(-1)`
`10MS^(-1)`
`5MS^(-1)`
zero

Answer :B
Discussion
2093.

Show graphically variation of AC with time. Explain the nature of the graph.

Answer»

Solution :
See Fig. In this case, the frequency of the alternating current (AC) produced is 50 HZ. The coil completes 50 rotations every second. The time for second, It is called the one rotation of the coil is periodic time or simply the PERIOD of AC. Positive current means the current FLOWS in one direction and NEGATIVE current means the current flows In theopposite direction in the external circuit. Here themaximum value of AC is 5 A.
Discussion
2094.

Among animals, the predators (like lions) have their eyes facing forward at the front of their heads, whereas the animal of prey (like rabbit) usually have eyes at the sides of their head. Why is this so ?

Answer»


SOLUTION :NA
Discussion
2095.

On the basis of your understanding of the following paragraph and the related studied concepts :Renewable energy sources such as wind energy are vital for the Indian economy, not only from the point of view of supply, but also from the perspective of environmental and social benefits. India is the world's fifth largest wind-power producer and the largest windmill failities in India are installed in Tamil Nadu. Muppandal is a small village of Tamil Nadu and one of the most important sites of wind - farm in the state. It uses wind from the Arbian Sea to produce renewable energy. The suitability of Muppandal as a site for wind farms stems from its geographical location as it has access to the seasonal monsoon winds.The electrical generators used on wind turbines in sites like Muppandal, produce an output a.c. of 240 V and a frequency of 50 Hz even when the wind speed is fluctuating. A transformer may be required to increased to increase or decrease the voltage so it is compatible with the end usage, distribution or trasmission voltage, depending on the type of interconnection.Why do you think Muppandal is at an advantageous position for this project ?

Answer»

Solution :Muppandal is in an ADVANTAGEOUS position from its GEOGRAPHICAL location because it has access to the SEASONAL WINDS.
Discussion
2096.

Find the equivalent resistance of the circuit shown in the following figure: Also find the total current flowing in this circuit.

Answer»

SOLUTION :`R = 4 OMEGA, I =3A`
Discussion
2097.

On the basis of your understanding of the following paragraph and the related studied concepts :Renewable energy sources such as wind energy are vital for the Indian economy, not only from the point of view of supply, but also from the perspective of environmental and social benefits. India is the world's fifth largest wind-power producer and the largest windmill failities in India are installed in Tamil Nadu. Muppandal is a small village of Tamil Nadu and one of the most important sites of wind - farm in the state. It uses wind from the Arbian Sea to produce renewable energy. The suitability of Muppandal as a site for wind farms stems from its geographical location as it has access to the seasonal monsoon winds.The electrical generators used on wind turbines in sites like Muppandal, produce an output a.c. of 240 V and a frequency of 50 Hz even when the wind speed is fluctuating. A transformer may be required to increased to increase or decrease the voltage so it is compatible with the end usage, distribution or trasmission voltage, depending on the type of interconnection.The output frequency of wind turbine is 50 Hz. What is meant by this statement ?

Answer»

Solution :The STATEMENT MEANS that the output a.c. completes 50 CYCLES in ONE second.
Discussion
2098.

If thevalue of g suddenly becomes twice its value, it will become two tmes more difficult to pull a heavy object along the floor. Why?

Answer»

Solution :i. if the value of g becomes double the force with which the earth pulls the objecti.e. weight ofobject becomes double.
ii. As weight increases, FRICTIONAL force also increase while pulling the object
III. Hence, it WIL BECOME TWO times more difficult to pull a heavy object along the floor.
Discussion
2099.

What happens to the focal length of the eye lens when ciliary muscles (i) relax (ii) contract ?

Answer»

SOLUTION :(i) When CILIARY muscles relax, eye LENS becomes THINNER and its focal length increases.
(ii) When ciliary muscles contract, eye lens becomes thicker and focal length decreases.
Discussion
2100.

On the basis of your understanding of the following paragraph and the related studied concepts :Renewable energy sources such as wind energy are vital for the Indian economy, not only from the point of view of supply, but also from the perspective of environmental and social benefits. India is the world's fifth largest wind-power producer and the largest windmill failities in India are installed in Tamil Nadu. Muppandal is a small village of Tamil Nadu and one of the most important sites of wind - farm in the state. It uses wind from the Arbian Sea to produce renewable energy. The suitability of Muppandal as a site for wind farms stems from its geographical location as it has access to the seasonal monsoon winds.The electrical generators used on wind turbines in sites like Muppandal, produce an output a.c. of 240 V and a frequency of 50 Hz even when the wind speed is fluctuating. A transformer may be required to increased to increase or decrease the voltage so it is compatible with the end usage, distribution or trasmission voltage, depending on the type of interconnection.(a) State the principle behind electric generator.

Answer»

Solution :PRINCIPLE behind electric generator is the phenomenon of electromagnetic INDUCTION which states that a voltage is induced across the ends of a COIL WHENEVER magnetic field linked with it is changing with time.
Discussion