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An object of mass 0.25kg moves at a height h above the ground with a speed of 4ms^–1. If it’s mechanical energy at this height is 12J. Determine the value of h [g = 10ms^–2]
Which of the following equations for the efficiency of a machine is correct?
The design of the thermostat on an electric iron is based on the
A metal rod of length 50cm is heated from 40˚C to 80˚C. IF the linear expansivity of the material is∝, Calculate the increase of the rod (in metres) in terms of∝
The cubic expansitivity of a certain gas at constant pressure 1/273 K^(-1). If the given mass of the gas is held at constant pressure and its volume at 0˚C is 273m^3. Determine the volume of the gas at 273˚C
The working principle of a pressure cooker is based on the
It takes a shorter time for a liquid to boil at the top of mountain than at the base because at the top, the
Light is considered as a transverse wave because it travels
In the day time, it is possible to see under shady areas such as under a tree, because light has undergone
The distance between a concave mirror and an object placed in front of it is 1.0m. If the radius of curvature of the mirror is 4.0m. The image formed will be
The image of an object formed by a convex mirror is
When viewed straight down, a fish in a pond is
A converging lens and a screen are placed 20cm and 80cm respectively from an object in a straight line so that a sharp image of the object is formed on the screen. If the object is 3cm high. Calculate the height of the image formed.
Which of the following defects of vision is as a result of the eye ball being too long?
A negatively charged rod is held close to an uncharged metal ball on an insulating stand. The ball will
If the charge on an object is measured as 4.0×10^–18 C, how many excess electron does the object possess, given that the charge of an electron is 1.6×10^–19 C?
Which of the following is a unit of the time rate of flow of electric charges?
Three capacitors each of capacitance 1.5µF are connected in series. The total capacitance in the circuit is.
A voltmeter is a device that
Which of the following actions will not increase the sensitivity of a moving coil galvanometer?