36. Direction of induced e.m.f. is determined by-
(A) Fleming’s left hand rule
(B) Fleming’s right hand rule
(C) Maxwell’s rule
(D) Ampere’s rule of swimming
(B) Fleming’s right hand rule
Explanation:
Fleming’s Right-Hand Rule is used to determine the direction of induced current or e.m.f. in a conductor moving through a magnetic field.
37. The use of reflector in the solar cooker is to
(A) decrease efficiency
(B) create green house effect
(C) increase efficiency
(D) no change in current
(C) increase efficiency
Explanation:
A reflector concentrates more solar radiation onto the absorbing surface, increasing the heat gain and thus the cooker’s efficiency.
38. In a series circuit with two resistors, if one resistor is removed:
(A) current increases
(B) current decreases
(C) circuit becomes open
(D) no change in current
(C) circuit becomes open
Explanation:
Removing any component from a series circuit breaks the single path for current, creating an open circuit where no current can flow.
39. A convex mirror is preferred as a rear-view mirror in vehicles because:
(A) It gives a larger field of view
(B) It always produces a virtual image
(C) It produces an enlarged image
(D) Both A and B
(D) Both A and B
Explanation:
A convex mirror provides a wider field of view and always forms an erect, virtual image, both of which are critical for safe driving.
40. When white light passes through a glass prism, the color that deviates the least is:
(A) Violet
(B) Green
(C) Blue
(D) Red
(D) Red
Explanation:
Red light has the longest wavelength and is therefore deviated (bent) the least during dispersion through a prism.
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