Due to which the depth of a pond filled with water is less visible?
(A) Refraction
(B) Reflection
(C) diffraction
(D) none of these
Which of the following has the highest energy?
(A) blue light
(B) red light
(C) yellow light
(D) green light
How will an air bubble in water behave?
(A) convex lens
(B) convex mirror
(C) concave lens
(D) concave mirror
What does the color of a star reveal about a star?
(A) distance to the star
(B) the temperature of the star
(C) the weight of the star
(D) the size of the star
The complementary color of yellow is?
(A) Orange
(B) red
(C) blue
(D) blue
What is the name of the device which converts alternating current into direct current?
(A) Rectifier
(B) transformer
(C) transmitter
(D) none of these
What is the unit of the magnetic field?
(A) Weber
(B) Domain
(C) Gauss
(D) Henry
The instrument used to change the speed of an electric fan is?
(A) Switch
(B) Rectifier
(C) Regulator
(D) Others
Which of the following is electromagnetic?
(A) Cobalt
(B) Chromium
(C) copper
(D) Nickel
Which one of the following is paramagnetic in nature?
(A) Hydrogen
(B) Oxygen
(C) Nitrogen
(D) Iron
Get the Examsbook Prep App Today