Question 4861:

Which of the following electromagnetic waves length?

A. Radio wires
B. \(x\)-rays
C. Infra-red
D. Blue light
E. Ultra violet

Question 4862:

Which of the following statements is correct?
Silvered walls of a vacuum flask are used to prevent ____________

A. Heat loss due to conduction
B. Vacuum loss
C. Heat entry into the inner flask due to convection
D. Heat loss due to radiation
E. Heat loss due to \(t\) convection

Question 4863:

The point beyond which a stretch spring does not return to its original length is called the ____________

A. Breaking,point
B. Elastic limit
C. Spring constant
D. Elasticity point
E. Release point

Question 4864:

The range of wavelengths of visible spectrum is \(400 nm -700 nm\) the wavelength of gamma rays is ____________

A. Longer than \(700 nm\)
B. Shorter than \(700 nm\) but longer than \(400 nm\)
C. \(550 nm\)
D. Shorter than \(400 nm\)
E. Infinite

Question 4865:

Which of the following arrangements in the sequence show can he used to ohtain a pure spectrum of white light?

A. Source, slit, converging lens, prism, converging lens, screen
B. Sourceslit, diverginglens, prism, diverging lens, screen
C. Source, converging lens, prism, diverging lens, screen
D. Source, slit, diverging lens, converging lens, screen
E. Source, slit, prism, diverging lens, screen