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Browse complete papersA body of mass m is dropped from a height h. When it has fallen through a distance of 2h/3, the ratio of its kinetic energy to potential energy is __________.
3:1
2:1
1:2
1:1
Correct answer
3:1
Before breakdown, increasing reverse voltage causes reverse saturation current to __________.
Become exactly zero
Change into forward current
Remain approximately constant
Increase rapidly from the beginning
Correct answer
Become exactly zero
According to the Aufbau principle, how are electrons distributed among atomic orbitals?
Electrons fill highest energy orbitals before lower ones
Orbital filling is independent of relative energy levels
Filling occurs in order of increasing energy of orbitals
Electrons occupy orbitals randomly without any energy order
Correct answer
Electrons fill highest energy orbitals before lower ones
Which functional group is commonly found in vinegar and gives it acidic properties?
Ester group
Amino group
Hydroxyl group
Carboxyl group
Correct answer
Ester group
Proton discovery is associated with which observation in discharge tube experiments?
Canal rays contain positively charged particles identified as protons
Cathode rays contain negatively charged particles identified as protons
Cathode rays contain photons emitted from metal electrodes
Canal rays contain neutral particles identified as neutrons
Correct answer
Canal rays contain positively charged particles identified as protons
Which of the following situations can represent non-uniform motion of a particle?
Equal distances covered in equal intervals of time.
A horizontal line in a velocity–time graph
A straight-line distance–time graph with constant slope
A curved distance–time graph
Correct answer
Equal distances covered in equal intervals of time.
Beta decay helps unstable nuclei achieve stability mainly by adjusting the __________.
Electron orbital speed only
Nuclear volume to infinity
Neutron-proton ratio
Atomic radius only
Correct answer
Electron orbital speed only
A molecule containing a hydroxyl group attached to a saturated carbon atom is most appropriately classified under which category?
It is an aldehyde
It is an ether
It is an alcohol
It is an amide
Correct answer
It is an aldehyde
The Bohr radius increases in higher orbits because the electron __________.
Stops revolving completely
Gains positive charge
Loses all kinetic energy
Moves farther from nucleus
Correct answer
Stops revolving completely
What happens to a plane wavefront after reflecting from a concave mirror whose principal axis is perpendicular to the incident wavefront?
It retains its structural orientation to emerge as a flat plane wavefront moving along the parallel axis.
It undergoes a shape transition to emerge as a spherical wavefront expanding outward toward infinity.
It breaks apart into irregular fragments to emerge as a highly scattered wave moving in random paths.
It undergoes a shape transition to emerge as a spherical wavefront converging toward a focal point.
Correct answer
It retains its structural orientation to emerge as a flat plane wavefront moving along the parallel axis.