Which one of the following of glass can cut ultraviolet rays:
A. Jena Glass
B. Soda Glass
C. Pyrex Glass
D. Crookes Glass
Optics does not deal with:
A. Nature of light waves
B. Properties of light
C. Characteristics of sound
D. Lenses and mirrors
The anti-matter is composed of:
A. Anti-electrons
B. Anti-proton
C. Anti-neutron
D. All of these
Power of a lens is one dioptre if its focal length is:
A. 1 meter
B. 2 meter
C. ½ meter
D. ¼ meter
Which of the following is a good moderator:
A. Helium
B. Cadmium
C. Graphite
D. Ordinary Water
Intensity level of threshold of pain is:
A. 60 db
B. 80 db
C. 100 db
D. 120 db
Value of ‘g’ at the surface of moon is:
A. 6ge
B. ge/6
C. 2ge
D. Zero
The co efficient of linear expansion is equal to:
A. ΔL = αLΔT
B. ΔL/LΔT
C. LΔT/ΔL
D. αLΔT-Δ
Ceramic magnets are:
A. Semiconductors
B. Insulators
C. Conductors
D. None of these
The reverse of LED is:
A. Diode
B. Resistor
C. Photodiode
D. Capacitor
