Chemistry-
Propan-2-ol on reacting with 
produces:
Chemistry-General
- Trichloroethanal
- Trichloroacetone
- Acetone
- None of these
Answer:The correct answer is: Trichloroacetone
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chemistry-
Anisole is the product obtained from phenol by the reaction known as
In presence of 
phenol reacts with alkyl halide and gives phenolic ether 
Vapours of 
with red hot 
(thoria) give anisole (phenolic ether). 
phenol reacts with alkyl halide and gives phenolic ether Vapours of with red hot (thoria) give anisole (phenolic ether). Anisole is the product obtained from phenol by the reaction known as
chemistry-General
In presence of phenol reacts with alkyl halide and gives phenolic ether Vapours of with red hot (thoria) give anisole (phenolic ether).
phenol reacts with alkyl halide and gives phenolic ether Vapours of with red hot (thoria) give anisole (phenolic ether). chemistry-
Proof spirit contains about:
The percentage of alcohol is expressed as proof spirit for tax lavy. It contains 57.1 % (by vol.) or 48% (by wt.) of alcohol.
Proof spirit contains about:
chemistry-General
The percentage of alcohol is expressed as proof spirit for tax lavy. It contains 57.1 % (by vol.) or 48% (by wt.) of alcohol.
chemistry-
Glycerol on oxidation with bismuth nitrate mainly gives:
Glycerol on oxidation with bismuth nitrate mainly gives:
chemistry-General
physics-
A convex lens makes a real image 4 cm long on a screen. When the lens is shifted to a new position without disturbing the object, we again get a real image on the screen which is 16 cm tall. The length of the object must be
A convex lens makes a real image 4 cm long on a screen. When the lens is shifted to a new position without disturbing the object, we again get a real image on the screen which is 16 cm tall. The length of the object must be
physics-General
physics-
The slit of a collimator is illuminated by a source as shown in the adjoining figures. The distance between the slit S and the collimating lens L is equal to the focal length of the lens. The correct direction of the emergent beam will be as shown in figure
In case of convex lens if rays are coming from the focus, then the emergent rays after refraction are parallel to principal axis.
The slit of a collimator is illuminated by a source as shown in the adjoining figures. The distance between the slit S and the collimating lens L is equal to the focal length of the lens. The correct direction of the emergent beam will be as shown in figure
physics-General
In case of convex lens if rays are coming from the focus, then the emergent rays after refraction are parallel to principal axis.
physics-
Two similar plano-convex lenses are combined together in three different ways as shown in the adjoining figure. The ratio of the focal lengths in three cases will be
In each case two plane-convex lens are placed close to each other, and 
.
.Two similar plano-convex lenses are combined together in three different ways as shown in the adjoining figure. The ratio of the focal lengths in three cases will be
physics-General
In each case two plane-convex lens are placed close to each other, and .
.physics-
White light is incident on the interface of glass and air as shown in the figure. If green light is just totally internally reflected then the emerging ray in air contains
and 
Yellow, orange and red have higher wavelength than green, so m will be less for these rays, consequently critical angle for these rays will be high, hence if green is just totally internally reflected then yellow, orange and red rays will emerge out.
White light is incident on the interface of glass and air as shown in the figure. If green light is just totally internally reflected then the emerging ray in air contains
physics-General
and Yellow, orange and red have higher wavelength than green, so m will be less for these rays, consequently critical angle for these rays will be high, hence if green is just totally internally reflected then yellow, orange and red rays will emerge out.
biology
Digestion of hormonal vesicle by lysosome is called -
Digestion of hormonal vesicle by lysosome is called -
biologyGeneral
physics-
A ray of light is incident at an angle i from denser to rare medium. The reflected and the refracted rays are mutually perpendicular. The angle of reflection and the angle of refraction are respectively r and r’, then the critical angle will be
(as Ði = Ðr)
A ray of light is incident at an angle i from denser to rare medium. The reflected and the refracted rays are mutually perpendicular. The angle of reflection and the angle of refraction are respectively r and r’, then the critical angle will be
physics-General
(as Ði = Ðr)physics-
A fish is a little away below the surface of a lake. If the critical angle is 
, then the fish could see things above the water surface within an angular range of 
where
From figure given in question 
A fish is a little away below the surface of a lake. If the critical angle is , then the fish could see things above the water surface within an angular range of where
physics-General
From figure given in question
chemistry-
In the below experiment, the value of P is
In the below experiment, the value of P is
chemistry-General
chemistry-
Which of the following molecule has the lowest average speed at 273K?
Which of the following molecule has the lowest average speed at 273K?
chemistry-General
physics-
The ray diagram could be correct
If 
then the lens will be in more denser medium. Hence its nature will change and the convex lens will behave like a concave lens.
then the lens will be in more denser medium. Hence its nature will change and the convex lens will behave like a concave lens.The ray diagram could be correct
physics-General
If then the lens will be in more denser medium. Hence its nature will change and the convex lens will behave like a concave lens.
then the lens will be in more denser medium. Hence its nature will change and the convex lens will behave like a concave lens.physics-
A ray of light passes through four transparent media with refractive indices 
as shown in the figure. The surfaces of all media are parallel. If the emergent ray CD is parallel to the incident ray AB, we must have
For successive refraction through different media 
constant. Here as 
is same in the two extreme media, 
.
constant. Here as is same in the two extreme media, .A ray of light passes through four transparent media with refractive indices as shown in the figure. The surfaces of all media are parallel. If the emergent ray CD is parallel to the incident ray AB, we must have
physics-General
For successive refraction through different media constant. Here as is same in the two extreme media, .
constant. Here as is same in the two extreme media, .physics-
An object is placed at a distance of 
from a convex lens. The image will be
(Given 
)
and 
So virtual at the focus and of double size.
An object is placed at a distance of from a convex lens. The image will be
physics-General
(Given ) and So virtual at the focus and of double size.