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A particle moves in a circular path with decreasing speed. Choose the correct statement.
a) Angular momentum remains constant
b) Acceleration is acting towards the centre
c) Particle moves in a spiral path with decreasing radius
d) The direction of angular momentum remains constant.
The answer is given as c). Kindly explain how it is c.
A Young's double slit experiment uses a monochromatic source. The shape of the interference fringes formed on a screen is
a) Hyperbola
b) Circle
c) Straight line
d) Parabola
Answer is given as d). Kindly explain.
In a experiment to determine the focal length (f) of a concave mirror by the u - v method, a student places the object pin A on the principal axis at a distance x from the pole P. The student looks at the pin and inverted image from a distance keeping his/her eye in line with PA. When the student shifts his/her eye towards left, the image appears to the right of the object. Then,
a) x < f
b) f < x < 2f
c) x = 2f
d) x > 2f
Answer is given as b). Kindly explain.
A 20 cm long capillary tube is dipped in water. The water rises upto 8 cm. If the entire arrangement is put in a freely falling elevator, the length of water column in the capillary tube will be
a) 8 cm
b)10 cm
c) 4 cm
d) 20 cm
Answer is given as d). Kindly explain how it is d)
For the following question, I feel answer is Option-C, because Carbon on obtaining electron gets a stable half filled 2p orbitals. Hence, Carbon should have high electron affinity. But the answer is given as Option-A. Kindly, confirm that Option-C is correct. If not, kindly explain how it is Option-A.
Question: The correct order of electron affinity of O, N, C and B are in the order a) B < C < O > N b) B > C > N > O c) B < C > O > N d) B > C < O < N
For the following question, answer is given as Option-a. Kindly give explanation for the answer.
In diamond, the co-ordination number of carbon is ...... and its unit cell has ...... carbon atoms. a) 4, 8 b) 4, 6 c) 6, 4 d) 4, 4
For the following question , kindly indicate the correct option and explanation.
The maximum number of water molecules that one water molecule can hold through hydrogen bonding is a) 2 b) 4 c) 6 d) 8
Find positive rational values for m and n, under the condition
Find the local maximum and local minimum values of the function y=x^x