When light rays are incident on a prism at an angle of 45°, the minimum deviation is obtained. If refractive index of the material of prism is 
, then the angle of prism will be
|
(a) 30° |
(b) 40° |
(c) 50° |
(d) 60° |
(d) 60°
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Three capacitors of capacitances 3 μF, 9μF and 18 μF are connected once in series and another time in parallel. The ratio of equivalent capacitance in the two cases 
will be
|
(a) 1 : 15 |
(b) 15 : 1 |
(c) 1 : 1 |
(d) 1 : 3 |
An electron enters between two horizontal plates separated by 2mm and having a potential difference of 1000V. The force on electron is
|
(a) 8 |
(b) 8 |
(c) 8 |
(d) 8 |
Assertion : Coloured spectrum is seen when we look through a muslin cloth.
Reason : It is due to the diffraction of white light on passing through fine slits.
|
(a) If both assertion and reason are true and the reason is the correct explanation of the assertion. |
|
(b) If both assertion and reason are true but reason is not the correct explanation of the assertion. |
|
(c) If assertion is true but reason is false. |
|
(d) If the assertion and reason both are false. |
Two positive charges of 20 coulomb and Q coulomb are situated at a distance of 60 cm. The neutral point between them is at a distance of 20 cm from the 20 coulomb charge. Charge Q is
|
(a) 30 C |
(b) 40 C |
(c) 60 C |
(d) 80 C |
A convex mirror of focal length f forms an image which is 
times the object. The distance of the object from the mirror is
|
(a) (n – 1)f |
(b) |
(c) |
(d) (n + 1)f |
Consider the following two statements A and B and identify the correct choice given in the answers
(A) Duddells thermo-galvanometer is suitable to measure direct current only
(B) Thermopile can measure temperature differences of the order of 
|
(a) Both A and B are true |
(b) Both A and B are false |
|
(c) A is true but B is false |
(d) A is false but B is true |
