Sample Test Physics

1
A proton was fired towards a positively charged plate located at a distance
x. As the proton reaches just close to the plate, it stops there. The surface
charge density of the plate is 4 x 10-6 C/m 2 If the proton was fired with the
initial kinetic energy of 85 eV, then what is the value of distance x?
  • 1 1.88 x 10-1 m
  • 2 1.88x10-2 m
  • 3 1.88 x 10-3 m
  • 4 1.88 x 10-4 m
2
When a paramagnetic substance is placed in a uniform magnetic field, the magnetic field lines
  • 1 return back after striking the substance
  • 2 pass through air without touching the substance
  • 3 Prefer to pass through the substance rather than through space.
  • 4 tend to move from stronger parts of the field to the weaker parts
3
In a single slit diffraction, first minima for red light of wavelength 699 nm coincide with the first maxima of a colour. What is the wavelength of the   unknown colour?
  • 1 633 nm
  • 2 599 nm
  • 3 533 nm
  • 4 466 nm
4
What would be the possible number of elements if elements with principal quantum numbers 2 greater than 4 did not exist in nature?
  • 1 49
  • 2 52
  • 3 55
  • 4 61
5
Which of the following statements is incorrect with reference to the nuclear forces?
  • 1 Nuclear forces can not be attractive
  • 2 Nuclear forces are independent of charge
  • 3 Nuclear forces do not obey inverse square law.
  • 4 Nuclear forces come into picture up to distance of the order of a few Fermi.
6
The expression q1 + q2 = 0 signifies that
  • 1 q1 and q2 are unequal charges having the same sign
  • 2 q1 and q2 are equal charges
  • 3 q1 and q2 are equal charges having the same sign
  • 4 q1 and q2 are equal charges with opposite signs
7
When we rub a glass rod with silk, then
  • 1 Mass of the glass rod increases
  • 2 Mass of the glass rod decreases
  • 3 Mass of silk decreases
  • 4 Mass of the glass rod as well as the silk increases
8
A material in which electrons are tightly bound and cannot move freely at room temperature is called a/an
  • 1 Semiconductor
  • 2 Superconductor
  • 3 Insulator
  • 4 Conductor
9
Two stones of different masses are thrown vertically upward with same initial velocity. Which one will rise to a greater height?
  • 1 Stone of lower mass
  • 2 Stone of higher mass
  • 3 Both will rise to the same height
  • 4 Information given is insufficient
10
  • 1 displacement is not constant
  • 2 motion is non-uniform.
  • 3 acceleration is not constant
  • 4 velocity is not constant

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