Question

Choose the correct alternative and write it along with its allotted
alphabet :
(i) Eka-boron was subsequently named as
(a) gallium (b) germanium (c) scandium (d) molybdenur
(ii) How much will a person with 72 N weight on the earth weigh on the
moon?
(a) 12 N (b) 36 N (c) 21 N (d) 63 N
(iii) The power of a convex lens of focal length 25 cm is .....
(a) + 4.0 D (b) 0.25 D (c) - 4.0 D (d) - 0.4 D
(iv) Silver gets corroded due to ......... in air.
(a) oxygen
(b) hydrogen sulphide
(c) carbon dioxide (d) nitrogen
(v) The speed of light in a medium of refractive index n is ........., where c
is the speed of light in vacuum.
(a) (b) nc (c)" (d)
1. (B) Solve the following questions :
(i) State whether the following statement is True or False :
The escape velocity of a body from the earth surface, Ves=2
esc
VR
(ii) Find the odd one out :
Reflection, neutralization, refraction, dispersion
​

Answer 1

Hey mate here is your answer :

1. (c) scandium
2. a) 12 N
3. (a) + 4.0 D
4. b) hydrogen sulphide
5. c/n
6. mention properly
7. neutralization

hope this will help you