2018 OOU Physics Post-UTME

What is the dimension for velocity?

A car moving with a velocity of 20m/s at 30⁰ to the horizontal, what is the components of the velocity along the horizontal?

If a moving car X collides headon with a moving car Y in the opposite direction, the conservation of momentum of X and Y is that:

A bullet of mass 20g travelling Horizontally at 100m/s, embeds itself in the centre of a block of wood 1kg which is suspended by light vertical string 1m, calculate the velocity

A car X moving of mass 500kg accelerates at 1ms^-2 when the force due to engine is 600N

Starting from rest a car of mass 1000kg accelerates steadily to 20m/s in 10secs, what is the average power developed?

A gun of mass 0.1kg has a bullet of mass 0.1kg, the bullet leaves the piston when fired at a velocity of 200m/s, find the final velocity

Which of the following pairs has one vector and scalar quantity?

If P is the momentum of an object, then the expression P²/m has the same unit as

A ship floating in clear water of density 1000kg moves to sea-water of density 1050kg where it floats, the upthrust on the ship then

In Coloumb’s law, the force between two point charges is proportional to

1. The square of the distance between them
2. Product of charges
3. Permittivity of the medium

If two equal charges each 1C were separated in air by distance of 1km, what would be the force between them

Two positive point charges of 12µC and 8µC are 10cm apart, find the work done in bringing them 4cm closer that is they are 6cm. Take 1/4πε₀ = 9 x 10⁹ Mf^-1

A steady current of 0.5A flows through a wire, how much charge passes through the wire in one minute?

The main evidence that light rays travel in a straight line is that

1. Incident, reflected and the normal lie in the same plane.
2. Pin-hole camera
3. Eclipse of the sun
4. Divergence of light ray

Determine the potential difference between the ends of a wire of resistance 5 Ω if 72⁰C passes through it per minute

For an AC circuit at resonance it means:

The image obtained with a converging lens is upright and three times the length of the object, if the focal length of the lens is 20cm, calculate the object distance

Which of the following are the characteristics of light rays:

1. Reflection
2. Refraction
3. Dispersion
4. Condition
5. Chromination

The two commonly used lenses in an Astronomical telescope are:

In dispersion of light rays which is odd out of the following:

1. It involves separation of colours
2. Separation is due to differences in speeds
3. All colours travel with the same speed in vacuum
4. No speed is involved

Sound waves and light waves cannot be

Which of the statements below are correct about threshold wavelength of a metal

1. Increases with frequency of light
2. Decreases with frequency of light
3. Increases with light intensity

A ball is projected from the ground at an angle of 30⁰ with the horizontal at an initial speed of 40ms^-1. Ignoring air friction, calculate the time it will take the ball to strike the ground. (Take acceleration due to gravity g = 10ms^-2).

Light of wavelength 450nm is shone on to the surface of a metal of work function 3.2×10^-19J, the maximum energy of emitted electron in 10^-19J is.

A woman weighs 500N and stand on a weighing balance in an elevator. If the elevator accelerates downwards at 1.2ms^-2, the reading of the balance is [g = 10ms^-2]

The type of radiation that does not have effect with electric or magnetic field is

How much water at 0⁰C is needed to cool 0.5kg of water at 80⁰C down 20⁰C?

The electromagnetic radiation with the strongest penetrating power is

A ball is dropped from a roof at the same time as another ball is thrown upward from the roof. The two balls

Which of the following particles is more strongly affected by magnetic field

A stone thrown upward has an acceleration that is

A car towing a trailer is accelerating on a level road. The car exerts a force on the trailer whose magnitude is

A solenoid has 2000 turns on its 40cm length. What is the magnetic field intensity at its centre if it carries a current of 5A?

How long does a bicycle with an acceleration of 0.8m/s² take to go from 4 to 12m/s?

A household refrigerator consumes electrical energy at the rate of 200W if the electricity cost 5k per kWh; calculate the cost (in naira) of operating the appliance for 30 days.

A stone is dropped from the top of a tall building and at the same time, another stone is thrown vertically upwards from the ground level with a velocity of 20m/s. the stones meet exactly 2s after their release. How tall is the building?

The resistivity of a metal such as copper increases with increasing temperature because

At what respective value of x, y and z would the Newton’s be dimensionally equivalent to M^xL^yT^z

A particle of charge q and mass m moving with a velocity v enters a uniform magnetic field B in the direction of the field. The force on the particles is

For which of the under listed quantities is the derived ML²T² correct?

I. Moment of a force

II. Work

III. Acceleration

A negativity charged rod is brought near the cap of an electroscope. The cap is earthed momentarily while the charge is near it. The rod is then removed. Which statement is correct?

If a source emits light at a frequency of 7×10¹⁴Hz and the Plank’s constant h=6.6×10^-34, the energy of one photon of this light is approximately equal to

A 2µF capacitor is charged to a potential of 200V and then isolated. When it is connected in parallel with a second capacitor which was initially not charged, the common potential becomes 40V. the capacitance of the second capacitor is

A radioactive nuclide of proton number X emits a -particle to form a new nuclide of proton number Y. the correct equation relating X and Y is

A proton charge 1.6×10^-19C is projected into a uniform magnetic field of flux density 5.0×10^-5 If the proton moves parallel to the field with a constant speed of 1.6×10⁶ms^-1, calculate the magnitude of the force exerted on it by the field.

A capacitor has a capacitance of 8µF with vacuum between its plates. Calculate the capacitance when a dielectric with dielectric constant 5.0 is placed between its plates.

How long does a bicycle with an acceleration of 0.8m/s² take to go from 4 to 12m/s?

A force of 200N acts at an angle of 140⁰ with respect to the positive x-direction. What are the components of this force in the x and y direction.

A car towing a trailer is accelerating on a level road. The car exerts a force on the trailer whose magnitude is