UI Physics 2018/2019 Past Questions

Practice each question, then open it to see the full details.

Which of the following optical instruments does not depend on the use of plane mirrors?

A.Kaleidoscope
B.Simple microscope
C.Sextant
D.Simple periscope

Which of the following statements supports the assumption that light travels in straight lines?

A.light can be diffracted
B.light can be reflected
C.a source of light produces interferences patterns on a suitably placed screen
D.a source of light produces distinct shadows of opaque objects

Which of the following is correct about nuclear fission? It is:

A.the splitting of a heavy nucleus into two or more lighter particles
B.an agent used to slow down neutrons in a controlled atomic chain reaction
C.combing light atomic nuclei to form heavy
D.the spontaneous disintegration occuring in the nucleus of certain atoms

A light energy E falls on a metal and the electrons with a maximum kinetic energy of 0.2eV are ejected. If the work function of the metal is 0.3eV, what is the value of E?

A.0.10eV
B.0.06eV
C.0.50eV
D.1.50eV

A nucleus is unstable if

A.it has two or more isotopes
B.its binding energy is not sufficient to hold nuclear particles together.
C.it is very light with very low density
D.it has no significant mass

Which of the following quantities of water has undergone the greatest change from its heat content at melting point?

A.0.5 kg of water at 3°C
B.0.2 kg of water at 8°C
C.0.005 kg of water at 80°C
D.0.1 kg of water at 12°C

Which would cause a more serious burn: 30 g of steam or 30 g of liquid water, both at 100 °C; and why is this so?

A.Water, because it is denser than steam.
B.Steam, because of its specific heat capacity.
C.Steam, because of its latent heat of vaporization.
D.Water, because its specific heat is greater than that of steam

A certain radioactive element has a half life of 20 years. How long will it take the activity to become 1/4 of its original?

A.20 years
B.40 years
C.60 years
D.80 years

A plane progressive wave is represented by y = 2sin(100t - 0.27πx) where all the symbols have their usual meanings. What is the velocity of the wave?

A.500ms^-1
B.400ms^-1
C.200ms^-1
D.100ms^-1

A point on a stationary wave where there is no movement of the medium is called

A.Node
B.Antinode
C.Note
D.Amplitude

If C is the thermal capacity of a material of mass m and S is its specific heat capacity, then

A.C = s/m
B.S = Cm
C.C = Sm
D.DS = m/s

A black car can be more uncomfortably hot on a warm day than a white car because

A.it is hot on a warm day
B.a black object is a better absorber of heat
C.black cars have heaters installed in them
D.white cars have air conditioning systems installed in them

The potential difference across the ends of a wire is doubled in magnitude. If Ohm's law is obeyed, one of the following statements concerning the resistance of the wire is true?

A.The resistance is one half of its original value.
B.The resistance is twice its original value.
C.The resistance is not changed.
D.The resistance increases by a factor of four

A piece of copper wire of length 100 cm at 30°C is heated to 120°C. If its linear expansivity is 1.8 x 10^4 /k, its new length is

A.166.6 cm
B.101.6 cm
C.180.6
D.1.08 cm

A sample of a monatomic ideal gas is originally at 20 C. What is the final temperature of the gas if both the pressure and volume are doubled?

A.5°C
B.80°C
C.20°C
D.899°C

A motor car moves with a velocity of $20ms^-1$ on a rough horizontal road and covers a displacement of 50 m. Find the coefficient of dynamic friction between the tyre and the ground (g = $10ms^-2$)

A.0.3
B.0.6
C.0.5
D.0.4

A physics student standing on the edge of a cliff throws a stone vertically downward with an initial speed of 10.0 m/s. The instant before the stone hits the ground below, it is traveling at a speed of 30.0 m/s. If the physics student were to throw the rock horizontally outward from the cliff instead, with the same initial speed of 10.0 m/s, what is the magnitude of the velocity of the stone just before it hits the ground?

A.10.0m/s
B.20.0m/s
C.30.0 m/s
D.40.0 m/s

A quantity is defined as the product of cross-sectional area and change in momentum per unit length. Which of the following is its SI unit?

A.Nm
B.kgs^-1
C.kgm²s^-1
D.Nkgs^-1

A rectangular concrete block 40 cm x 30 cm x 60 cm of mass 10 kg rests on a horizontal flat surface. What is the minimum pressure it can possibly exert on the surface?

A.816.6 Nm^2
B.816.6 Nm^2
C.555.56Nm^-2
D.608.4 Nm

A simple hydrometer consists of uniform cylinder suitably weighted to float upright in most common liquids. It is graduated to read the relative density of a liquid directly. Which of the following is NOT correct?

A.When placed in a liquid, it displaces exactly its own weight of the liquid
B.Its graduation increases from top to base
C.When placed in a liquid, it displaces exactly its own volume of the liquid
D.The product of the volume and density of liquid displaced is equal to its mass

The angle between the earth's magnetic field and the horizontal is called angle of

A.declination
B.dip
C.variation
D.inclination

The basic difference between the galvanometer and the electric motor is

A.The size of the magnetic fields
B.The presence of hair springs in the galvanometer
C.The soft iron armature in the galvanometer
D.The couple formed on the parallel sides of the rectangular coil in the

The electromotive force is in such a direction as to oppose the motion or charge producing it. This is a statement of

A.Faraday's Law
B.Lenz Law
C.Maxwell Law
D.Ampere's law

The potential difference across the ends of a wire is doubled in magnitude. If Ohm's law is obeyed, one of the following statements concerning the resistance of the wire is true?

A.The resistance is one half of its original value.
B.The resistance is twice its original value.
C.The resistance is not changed.
D.The resistance increases by a factor of four

The process of adding impurity to a semiconductor to increase its conductivity is called

A.Doping
B.Annealing
C.Heating
D.Hardening