Advertisements
Advertisements
From α, β and γ-rays, name the one which travels with the speed of light?
Concept: undefined >> undefined
From α, β and γ-rays, name the one which is not affected by electric or magnetic field?
Concept: undefined >> undefined
Advertisements
What is the value of the speed of gamma radiations in air or vacuum?
Concept: undefined >> undefined
Explain, why radium paint, consisting of zinc sulphide and a trace of radium salt, glows in the dark?
Concept: undefined >> undefined
State one use of radio-isotopes.
Concept: undefined >> undefined
It is advised not to touch a radioactive substance by hand. Give reason.
Concept: undefined >> undefined
State three ways of obtaining an electron-beam.
Concept: undefined >> undefined
Mention four properties of Becquerel rays.
Concept: undefined >> undefined
Mention one important function of ear main parts:
State the principle on which the functioning of a nuclear reactor is based.
Concept: undefined >> undefined
(a) Which one of the following graphs A or B shows free vibrations in a vacuum and which one shows free vibrations in a medium?
(b) How did you come to this conclusion.
Concept: undefined >> undefined
State one advantage of single movable pulley.
Concept: undefined >> undefined
Calculate the power spent by a crane while lifting a load of mass 2000 kg, at velocity of 1.5 ms-1. (g = 10 ms-2)
Concept: undefined >> undefined
The diagram below shows two parallel rays A (Orange) & B (Blue) incident from air, on air-glass boundary.
- Copy and complete the path of the rays A and B.
- How do the speeds of these rays differ in glass?
- Are the two refracted rays in glass parallel? Give a reason.
Concept: undefined >> undefined
A radioactive element is placed in an evacuated chamber. Then the rate of radioactive decay will ______.
Concept: undefined >> undefined
| Meera chose to use a block and tackle system of '9' pulleys instead of a single movable pulley to lift a heavy load. |
Why should she connect more number of pulleys in the upper fixed block?
Concept: undefined >> undefined
Complete the following radioactive reaction:
\[\ce{^-_-X -> ^-_-Y + ^4_2He -> ^234_91Z + ^0_-1e}\]
Concept: undefined >> undefined
In the following atoms, which one is a radioisotope? Give one use of this isotope.
O16, C14, N14, He4
Concept: undefined >> undefined
Unit of power used in mechanical engineering is ______.
Concept: undefined >> undefined
A block and tackle system of pulleys has a velocity ratio of 4.
- Draw a labelled diagram of the system indicating clearly the direction of the load and effort.
- Calculate the potential energy of the load 100 kgf lifted by this pulley to a height 5 m. (g = 10 ms−2)
Concept: undefined >> undefined
Name the quantity which is measured in kWh.
Concept: undefined >> undefined
