A bread toaster uses a current of 4A when plugged in a 240V line. it takes 1 minute to toast slices of bread. what is the energy consumed by the toaster

• A. 5.76 x 10⁴J
• B. 1.60 x 10⁴J
• C. 3.60 x 10³J
• D. 1.60 x 10²J

Gamma rays are produced when

• A. high velocity electrons are abruptly stopped in metals
• B. energy changes occur within the nucleus of atoms
• C. energy changes occur within the electronic structure of atoms
• D. electrons are deflected in very strong magnetic fields

A particle of weight 120N is placed on a plane inclined at 300 to the horizontal. If the plane has an efficiency of 60% to the floor what is the force required to push the weight uniformly up the plane?

• A) 50N
• B) 100N
• C) 175N
• D) 210N

The maximum kinetic energy of the photoelectron emitted from a metal surface is 0.34eV. If the work function of the metal surface is 1.83eV,find the stopping potential.

• A. 2.17V
• B. 1.49V
• C. 1.09V
• D. 0.34V

A liquid is left in an open dish. After several days, there is less liquid in the dish. Which of the following statements explains this observation? The

• A. most energetic molecules leave the surface and escape into the air.
• B. least energetic molecules leave the surface and escape into air.
• C. most energetic molecules leave the surface and return.
• D. least energetic molecules leave the surface and return.

What type of reaction is represented by the equation \(^{2}_{1}X+^{2}_{1}X\rightarrow^{3}_{2}Y+^{1}_{0}n+Energy\)

• A. Ionization
• B. Fusion
• C. Fission
• D. Chain

(a) Explain the terms:

(i) thermal equilibrium;

(ii) fundamental interval.

(b) List two uses of the hydraulic press.

(c) Name the material used to reset the steel index in the Six's maximum and minimum thermometer.

(d)(i) A nursing mother prepared her baby's milk mixture at 85°C, in a feeding bottle. In order to cool it to 40°C, she immersed the bottle in an aluminium bowl of heat capacity 90 JK\(^{-1}\) containing 500 g of water at 26°C. If the mass of the mixture is 300g, calculate the specific heat capacity of the mixture. [Neglect heat losses and heat capacity of the bottle; specific heat capacity of water = 4200 J kg\(^{-1}\) K\(^{-1}\)]

(ii) (\(\alpha\)) Name two ways through which the bottle losses heat.

(\(\beta\)) Name two industrial processes in which heat exchanger is used.

A positively charged glass rod is placed by near the cap of a positively charge electroscope. The divergence of the leaf is observed to

• A. decrease
• B. increase
• C. remain the same
• D. increase and collapse immediately

Two magnets are used to magnetize a soft iron bar PQ as illustrated in the diagram given. The correct polarity at P and Q respectively

• A. S and N
• B. N and N
• C. S and S
• D. N and S

In an electrolysis experiment, the ammeter records a steady current of 1A. The mass of copper deposited is 0.66g in 30 minutes. Calculate the error in the ammeter reading (Electrochemical equivalent of copper = 0.00033g C\(^{-1}\)).