Laser beams are used to measure long distance because
Options
(a) they are monochromatic (b) they are highly polarised (c) they are coherent (d) they have high degree of parallelism
Correct Answer:
they […]
Energy bands in solids are a consequence of
Options
(a) Ohm’s law (b) Pauli’s exclusion principle (c) Bohr’s theory (d) Heisenberg’s uncertainty principle
Correct Answer:
Bohr’s theory
Explanation:
No explanation available. Be the […]
If an electron and a positron annihilate, the energy released is
Options
(a) 3.2×10⁻¹³ J (b) 1.6×10⁻¹³ J (c) 4.8×10⁻¹³ J (d) 6.4×10⁻¹³ J
Correct Answer:
1.6×10⁻¹³ J
Explanation:
No explanation available. Be […]
An α-particle and a proton travel with the same velocity in a magnetic field perpendicular to the direction of their velocities. The ratio of the radii of their respective circular paths is
Options
The momentum is most closely related to
Options
(a) Force (b) Impulse (c) Power (d) Kinetic energy
Correct Answer:
Force
Explanation:
Force is rate of chance of momentum.
Dimensions of Torque are
Options
(a) ML²T⁻² (b) MLT (c) M⁰L⁰T² (d) M²L⁻²T²
Correct Answer:
ML²T⁻²
Explanation:
No explanation available. Be the first to write the explanation for this question by commenting […]
Which is incorrect about thermal process
Options
(a) In an isobaric process ΔP=0 (b) In an isochoric process ΔW=0 (c) In an isothermal process ΔT=0 (d) In an isothermal process ΔQ=0
Correct Answer: […]
If a magnetic substance is kept in a magnetic field, then which of the following is thrown out
Options
(a) paramagnetic (b) ferromagnetic (c) diamagnetic (d) antiferromagnetic
Correct Answer:
diamagnetic
Explanation:
No explanation […]
If the red light is replaced by blue light illuminating the object in a microscope, the resolving power of the microscope
Options
(a) decreases (b) increases (c) gets halved (d) remains unchanged
Correct […]
2017 Copyright Doctor Dreams Training Academy