J physics 18

When an atom loses or gain a charge it becomes

Temperature is the property of a body which is proportional to the ____.

A man hears his echo from a nearby hill 2s after he shouted. If the frequency of his voice is 260Hz and the wavelength is 1.29m, how far away is the hill

In a series R-L-C circuit at resonance, the voltages across the resistor and the inductor are 30V and 40V respectively. What is the voltage across the capacitor?

A car traveled at a uniform speed of 100km/h, spends 15m moving from point A to point B along its route. The distance between A and B is

The process whereby a liquid turns spontaneously into vapour is called

A man walks 1km due east and then 1 km due north. His displacement is

A pulley system has three pulleys in the fixed block and two in the movable block and if the pulley has an efficiency of 72%, the mechanical advantage of the system is?

What is the resultant resistance of the circuit in the image shown?

The force between the molecules of a liquid in contact with that of a solid is?

An object is placed 20cm from a concave mirror of focal length 10cm. The linear magnification of the image produced is?

Which of the following does NOT describe the Image formed by a plane minor?

Which of the following diagrams represents correctly an n-p-n transistor?
i.
ii.
iii.
iv.

Which of the following instruments is most suitable for measuring the outside diameter of a narrow pipe in a few millimeters in diameter?

An electric heating coil rated at 1KW is used to heat 2kg of water for 2 minutes. The initial water temperature is 30°C. Taking the specific heat of the water as 4,000Jkg⁻¹ and neglecting that of the container, the final water temperature is

The process by which protons are converted into helium atoms with a tremendous release of energy is called?

The density of 400cm³ of palm oil was 0.9gcm^-3 before frying. If the density of the oil was 0.6gcm^-3 after frying, assuming no loss of oil due to spilling, its new volume was?

The time rate of loss of heat by a body is proportional to the

Palm oil from a bottle flows out more easily after it has been heated because the

For what values of \( F \) and \( \theta \) will the forces shown in the diagram below be in equilibrium.

An object weighs 30N in air and 21N in water. The weight of the object when completely immersed in a liquid of relative density 1.4 is

A boy receives the echo of his clap reflected by a nearby hill 0.8s later. If the speed of sound in air is 3.40ms⁻¹, how far is he from the hill?

An object moves in a circular path of radius 0.5m with a speed of 1ms⁻¹. What is its angular velocity?

Water of mass 150g at 60°c is added to 300g of water at 20°c and the mixture is well stirred. Calculate the temperature of the mixture.(neglect heat losses to the surroundings)

The amount of heat needed to raise the temperature of 10kg of Copper by 1K is its

The diagram shown represents a block-and-tackle pulley system on which an effort of W Newtons supports a load of 120.0N. If the efficiency of the machine is 40, then the value of W is?

A ball of mass 800g moving horizontally with a speed of 5m/s hits a vertical wall and rebounds with the same speed. The impulse experienced by the ball is?

The efficiency of energy conversion on the energy flow through a hydroelectric power is?

Which of the following obeys Ohm's law?

Which of the following is true of an electrical charge?

In homes, electrical appliances and lamps are connected in parallel because

Which of the following is the dimension of pressure

The friction which exist between two layers of liquid in relative motion is called

A narrow beam of white light can be split up into different colours by a glass prism. The correct explanation is that

Which of the following phenomena is the practical evidence for the existence of the continual motion of molecules

The inner diameter of a small test tube can be measured accurately using a

Which of the following may be used to explain a mirage?

I. Layers of air near the road surface have varying refractive indices in hot weather

II. Road surfaces sometimes become good reflectors in hot weather

III. Light from the sky can be reflected upwards after coming close to the road surface.

Which of the following concepts is not an evidence of the particles nature of matter?

In the diagram shown, If the south-poles of two magnets stroke a steel bar, the polarities at T and V will respectively be

The energy needed to move a unit positive charge around a complete electric circuit is called the