Which of the following has the highest resistivity?
- (A) Carbon
- (B) Germanium
- (C) Constantan
- (D) Nichrome
- (B) Germanium
When the diameter of a wire is doubled, its resistance becomes:
- (A) Double
- (B) Four times
- (C) One-half
- (D) One-fourth
- (D) One-fourth
The ordinary and maximum tolerance limit of sound by human being is:
- (A) 50 dB to 70 dB
- (B) 60 dB to 80 dB
- (C) 65 dB to 75 dB
- (D) 70 dB to 85 dB
- (B) 60 dB to 80 dB
Out of the following which is not a poor conductor?
- (A) Cast iron
- (B) Copper
- (C) Carbon
- (D) Tungsten
- (B) Copper
A flying jet possesses:
- (A) Potential energy
- (B) Kinetic energy
- (C) Both (A & B)
- (D) Elastic energy
- (C) Both (A & B)
Which rays can be used in cancer treatment?
- (A) Radio rays
- (B) Gamma rays
- (C) X-rays
- (D) Ultraviolet rays
- (B) Gamma rays
Air bubble in water shines because of the phenomenon of:
- (A) Refraction
- (B) Dispersion
- (C) Total internal reflection
- (D) Diffraction
- (C) Total internal reflection
An electric current can produce _______ effect.
- (A) Mechanical
- (B) Electrical
- (C) Heating
- (D) All of these
- (D) All of these
Electromagnet is constructed with which of the following?
- (A) Steel
- (B) Soft iron
- (C) Aluminum
- (D) Nickel
- (B) Soft iron
The approximation in which original length is very small as compared to final stretched length is:
- (A) Elastic approximation
- (B) Non-elastic approximation
- (C) Slinky approximation
- (D) Rigid approximation
- (A) Elastic approximation