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1851.

On a two-lane road, car A is travelling with a speed of 36 km h Two cars B and Capproach car A in opposite directions with a speed of 54 km h each. At a certain instant,when the distance AB is equal to AC, both being 1 km, B decides to overtake A before Cdoes. What minimum acceleration of car B is required to avoid an accident?

Answer» On a two-lane road, car A is travelling with a speed of 36 km h Two cars B and Capproach car A in opposite directions with a speed of 54 km h each. At a certain instant,when the distance AB is equal to AC, both being 1 km, B decides to overtake A before Cdoes. What minimum acceleration of car B is required to avoid an accident?
1852.

Which of the following figures shows the correct image of "P” in the mirror?

Answer»

Which of the following figures shows the correct image of "P” in the mirror?



1853.

what is quantisation of energy ? write its defination and explain

Answer» what is quantisation of energy ? write its defination and explain
1854.

36. Find out the total charge present on 5.5Mole NH4+ ions.

Answer» 36. Find out the total charge present on 5.5Mole NH4+ ions.
1855.

Which of the following are good sources of vitamin B1?

Answer»

Which of the following are good sources of vitamin B1?

1856.

Two cylinders contain same amount of idealmonatomic gas. Same amount of heat is given totwo cylinders. If temperature rise in cylinder A is Tothen temperature rise in cylinder B will be43(1)-石(2) 2石(3) 2Free pistonFixed piston5HeatHeat

Answer» Two cylinders contain same amount of idealmonatomic gas. Same amount of heat is given totwo cylinders. If temperature rise in cylinder A is Tothen temperature rise in cylinder B will be43(1)-石(2) 2石(3) 2Free pistonFixed piston5HeatHeat
1857.

A ___ mirror is used as a rear-view mirror in vehicles.

Answer»

A ___ mirror is used as a rear-view mirror in vehicles.

1858.

the speed of a light in a medium of refractive index 2?

Answer» the speed of a light in a medium of refractive index 2?
1859.

If the frequency of a wave is 10 Hz, what is the time period?

Answer»

If the frequency of a wave is 10 Hz, what is the time period?

1860.

The process of depositing a layer of a desired metal on another material by means of electricity is called __.

Answer»

The process of depositing a layer of a desired metal on another material by means of electricity is called __.



1861.

why is uniform circular motion called uniformly accelerated motion

Answer» why is uniform circular motion called uniformly accelerated motion
1862.

if several forces act on a body in a different direction, In which direction body move?

Answer»

if several forces act on a body in a different direction, In which direction body move?

1863.

two identical plane mirrors are parallel to each other at a dis†an ce \sqrt3cm, length of the plane mirror is 1m. If a light is reflected at an angke of 30^{†extbullet }at the edges of one mirror then the total number of reflection before it comes out of the mirror? options- i. 50 ii.100 iii.150 iv.5

Answer» two identical plane mirrors are parallel to each other at a dis†an ce \sqrt3cm, length of the plane mirror is 1m. If a light is reflected at an angke of 30^{†extbullet }at the edges of one mirror then the total number of reflection before it comes out of the mirror? options- i. 50 ii.100 iii.150 iv.5
1864.

How can three charges be in stable equilibrium. Show figure

Answer» How can three charges be in stable equilibrium. Show figure
1865.

Chromium has a shiny appearance and it does not corrode. Then why only a thin coating of it is used instead of using it to make the complete material?

Answer»

Chromium has a shiny appearance and it does not corrode. Then why only a thin coating of it is used instead of using it to make the complete material?


1866.

Why does the tip of a lightning conductor have a pointed end?

Answer» Why does the tip of a lightning conductor have a pointed end?
1867.

A person measures the depth of well by measuring the time interval between dropping a Stone and receiving the sound of impact with the well . the error in his measurement is 0.01 secs. and he measure the Depth of well to bel=20m (1)g(no error) at m/s square (2)velocity of sound=300m/s Find: DL/L in %

Answer» A person measures the depth of well by measuring the time interval between dropping a Stone and receiving the sound of impact with the well . the error in his measurement is 0.01 secs. and he measure the Depth of well to bel=20m (1)g(no error) at m/s square (2)velocity of sound=300m/s Find: DL/L in %
1868.

when we take a tempered glass or a simple mirror which do not have any shiny surface , and keep it ahead of any black or brown cloth , then our image forms why ?

Answer» when we take a tempered glass or a simple mirror which do not have any shiny surface , and keep it ahead of any black or brown cloth , then our image forms why ?
1869.

What causes storm on Jupiter?

Answer» What causes storm on Jupiter?
1870.

Question 4 (b)An archer stretches her bow while taking aim at the target. She then releases the arrow, which begins to move towards the target. Based on this information fill up the gaps in the following statements using the following terms:muscular, contact, non-contact, gravity, friction, shape, attraction(b) The force applied by the archer to stretch the bow is an example of ___ force.

Answer»

Question 4 (b)

An archer stretches her bow while taking aim at the target. She then releases the arrow, which begins to move towards the target. Based on this information fill up the gaps in the following statements using the following terms:



muscular, contact, non-contact, gravity, friction, shape, attraction



(b) The force applied by the archer to stretch the bow is an example of ___ force.



1871.

What is induction?

Answer» What is induction?
1872.

Which of the following is true for a force to come into play?

Answer»

Which of the following is true for a force to come into play?


1873.

___ is a graph which records an Earthquake.

Answer»

___ is a graph which records an Earthquake.

1874.

Why is electrical wiring usually made of copper, not silver?

Answer»

Why is electrical wiring usually made of copper, not silver?


1875.

Explain the process of induction incase when the charged body taken is positive

Answer» Explain the process of induction incase when the charged body taken is positive
1876.

Find the values of a for which y=ax³+3x²+(2a+1)x+1000 is strictly decreasing. (x belongs to R)

Answer» Find the values of a for which y=ax³+3x²+(2a+1)x+1000 is strictly decreasing. (x belongs to R)
1877.

at 100^° C the vapour pressure of a solution of 6.25 g of a solute in 100g waterb is 732 mm . if kb =052,th bil boling point of solution?

Answer» at 100^° C the vapour pressure of a solution of 6.25 g of a solute in 100g waterb is 732 mm . if kb =052,th bil boling point of solution?
1878.

Which alternative does not pair a constellation with the number of prominent stars in it?

Answer»

Which alternative does not pair a constellation with the number of prominent stars in it?


1879.

State two factors on which the pressure at a point in a liquid depends.

Answer»

State two factors on which the pressure at a point in a liquid depends.

1880.

if wire is stretched to decrease its radius by 2% then the percentage change in its reis†an c

Answer» if wire is stretched to decrease its radius by 2% then the percentage change in its reis†an c
1881.

What is the law of floating?

Answer»

What is the law of floating?

1882.

58. Ratio of mean square velocity and mean square velocity of x component

Answer» 58. Ratio of mean square velocity and mean square velocity of x component
1883.

Why does common salt become wet in the rainy season?

Answer»

Why does common salt become wet in the rainy season?

1884.

If positive body is brought near a isolated spherical body what will be the effect on the internal part of the sphere and the surface of the sphereDoes the induce charge remain only on the surface or gets induced in the body?

Answer» If positive body is brought near a isolated spherical body what will be the effect on the internal part of the sphere and the surface of the sphere
Does the induce charge remain only on the surface or gets induced in the body?
1885.

A container with 1 kg of water in it is kept in sunlight, which causes the water to get warmer than the surroundings. The average energy per unit time per unit area received due to sunlight is 700 Wm−2 and it is absorbed by the water over an effective area of 0.05 m2. Assuming that the heat loss from the water to the surroundings is governed by Newton's law of cooling, the difference (in ∘C) in the temperature of water and the surroundings after a long time will be (Ignore the effect of the container, and take constant for Newton's law of cooling =0.001∘C−1, heat capacity of water =4200 J kg−1k−1)

Answer» A container with 1 kg of water in it is kept in sunlight, which causes the water to get warmer than the surroundings. The average energy per unit time per unit area received due to sunlight is 700 Wm2 and it is absorbed by the water over an effective area of 0.05 m2. Assuming that the heat loss from the water to the surroundings is governed by Newton's law of cooling, the difference (in C) in the temperature of water and the surroundings after a long time will be (Ignore the effect of the container, and take constant for Newton's law of cooling =0.001C1, heat capacity of water =4200 J kg1k1)
1886.

Give scientific reasons.(a) In earlier times, people used to listen for the arrival of a distant train by putting their ear to the rail.(b) The sounds generated by a tabla and a sitar are different.(c) If you were both on the moon , your friend will not be able to hear you call.(d) We can hear the movement of a mosquito's wings but we cannot hear the movement of our hands.

Answer» Give scientific reasons.



(a) In earlier times, people used to listen for the arrival of a distant train by putting their ear to the rail.



(b) The sounds generated by a tabla and a sitar are different.



(c) If you were both on the moon , your friend will not be able to hear you call.



(d) We can hear the movement of a mosquito's wings but we cannot hear the movement of our hands.
1887.

Why do clothes dry faster on a sunny day than on a cloudy day?

Answer» Why do clothes dry faster on a sunny day than on a cloudy day?
1888.

Frame a formula for finding the number of minutes m in X hours, y minutes and z seconds.

Answer» Frame a formula for finding the number of minutes m in X hours, y minutes and z seconds.
1889.

An electric current is passed through a conducting solution. List any three possible observations.

Answer» An electric current is passed through a conducting solution. List any three possible observations.
1890.

An electric bell is suspended in an airtight vacuum jar. The bottom of the jar is connected to an air pump, as shown in the given figure. The air pump can fill air in the jar. What will happen when the switches of both the bell and the pump are pressed?

Answer»

An electric bell is suspended in an airtight vacuum jar. The bottom of the jar is connected to an air pump, as shown in the given figure. The air pump can fill air in the jar.

What will happen when the switches of both the bell and the pump are pressed?


1891.

Calculate the argument of 2016 - 2016i?

Answer» Calculate the argument of 2016 - 2016i?
1892.

ntif acceleration of a particle is proportional to the square of displacement x ,then its velocity varies with displacement x as ?n

Answer» ntif acceleration of a particle is proportional to the square of displacement x ,then its velocity varies with displacement x as ?n
1893.

The strips of an electroscope diverge when a charged body is brought in contact with the metal clip. Now the clip is touched gently by our hand. What will happen to the strips? Explain.

Answer» The strips of an electroscope diverge when a charged body is brought in contact with the metal clip. Now the clip is touched gently by our hand. What will happen to the strips? Explain.


1894.

If the limiting friction is 60 N and the Force acting on it is 61 N then the object will move or not

Answer» If the limiting friction is 60 N and the Force acting on it is 61 N then the object will move or not
1895.

What is a stapes

Answer» What is a stapes
1896.

Why are dams broader at the base and narrow at the top?

Answer»

Why are dams broader at the base and narrow at the top?


1897.

what are the features of a convex mirror to be used as rear view mirror ? also,define principal focus of a convex mirror.

Answer» what are the features of a convex mirror to be used as rear view mirror ? also,define principal focus of a convex mirror.
1898.

Garima feels that she is suffering from fever. Which of the following instruments can be used by Sushweta to find out whether or not she has a fever?

Answer»

Garima feels that she is suffering from fever. Which of the following instruments can be used by Sushweta to find out whether or not she has a fever?


1899.

among V,Cr,Mn and Fe which will have the highest magnetic momen

Answer» among V,Cr,Mn and Fe which will have the highest magnetic momen
1900.

42. When applied force is less than frictional force , then, value of frictional force acting is e.g. A block of 10 kg is moving on a rough surface . The frictional force is

Answer» 42. When applied force is less than frictional force , then, value of frictional force acting is e.g. A block of 10 kg is moving on a rough surface . The frictional force is