Free KCSE Physics Topical Questions KNEC Standards

K.C.S.E Physics Q & A - MODEL 2018PP1QN17

29/7/2020

K.C.S.E Physics Q & A - MODEL 2018PP1QN17

(a) State Pascal’s principle of transmission of pressure in liquids.
(b) Figure 10 shows heights of two immiscible liquids X and Y in a U-tube (drawn to scale).

(i) State with a reason which of the two liquids X and Y has a higher density.
(ii) Determine the value of h.
(iii) Given that the density of liquid Y is p, write down an expression for the density d of liquid X ¡n terms of p.
(c) (i) With the aid of a diagram, describe how a liquid may be siphoned from one container to another using a flexible tube.
(ii) State one application of the siphon.

answers

(a) Pressure applied at one part in a liquid is transmitted equally to all other parts of the enclosed liquid.

K.C.S.E Physics Q & A - MODEL 2018PP1QN17

K.C.S.E Physics Q & A - MODEL 2018PP1QN16

K.C.S.E Physics Q & A - MODEL 2018PP1QN14

(i) quantity of heat lost by steam to change to water at 100 °C. (ii) quantity of heat lost by water to cool to 0°C. (iii) mass of ice melted at 0°C.

K.C.S.E Physics Q & A - MODEL 2017PP2QN19

State the names of the parts labelled B1 and B2. (ii) State and explain the function of the part marked A. (b) Figure 11 shows a trace of a signal observed on the screen of a CRO. The time-base setting is 20 mscm-2

K.C.S.E Physics Q & A - MODEL 2017PP2QN18

K.C.S.E Physics Q & A - MODEL 2017PP2QN17

K.C.S.E Physics Q & A - MODEL 2017PP2QN16

K.C.S.E Physics Q & A - MODEL 2017PP2QN15

K.C.S.E Physics Q & A - MODEL 2017PP1QN18

K.C.S.E Physics Q & A - MODEL 2017PP1QN17

K.C.S.E Physics Q & A - MODEL 2017PP1QN16

(b) The following data was obtained from an experiment to determine the size of a palm oil molecule. — Volume of 100 drops of palm oil = 15.0mm3 — Area of a patch from one drop of oil = 8.0 X 104 mm2 Determine the size of a palm oil molecule.

K.C.S.E Physics Q & A - MODEL 2017PP1QN15

From the graph determine; (i) The spring constant K, (ii) The load that causes an extension of 3 X 10-2 m. (c) Three identical springs of spring constant 100 Nm-1 are arranged as shown in Figure 5 to support a 5 N load.

K.C.S.E Physics Q & A - MODEL 2017PP1QN14

K.C.S.E Physics Q & A - MODEL 2016PP2QN18

K.C.S.E Physics Q & A - MODEL 2016PP2QN17

K.C.S.E Physics Q & A - MODEL 2016PP2QN16

K.C.S.E Physics Q & A - MODEL 2016PP2QN15

K.C.S.E Physics Q & A - MODEL 2016PP2QN14

K.C.S.E Physics Q & A - MODEL 2016PP1QN18

K.C.S.E Physics Q & A - MODEL 2016PP1QN17

K.C.S.E Physics Q & A - MODEL 2016PP1QN16

(a)Define the term velocity ratio of a machine. (b) Fig. 12 shows part of a hydraulic press. The plunger is the position where effort is applied while the Ram piston is the position where load is applied. The plunger has cross-section area, a m2 while the Ram piston has cross-section area, A m2.

K.C.S.E Physics Q & A - MODEL 2016PP1QN15

K.C.S.E Physics Q & A - MODEL 2016PP1QN14

b) Water of mass 3.0kg initially at 200C is heated in an electric kettle rated 3.0KW. The water is heated until it boils at 1000C. (Take specific heat capacity of water 4200Jkg1K-1. Heat capacity of the kettle = 450JK-1, Specific latent heat of vaporization of water = 2.3Mjkg-1)

K.C.S.E Physics Q & A - MODEL 2015PP2QN18

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(i) quantity of heat lost by steam to change to water at 100 °C.
(ii) quantity of heat lost by water to cool to 0°C.
(iii) mass of ice melted at 0°C.

State the names of the parts labelled B₁ and B₂.
(ii) State and explain the function of the part marked A.
(b) Figure 11 shows a trace of a signal observed on the screen of a CRO. The time-base setting is 20 mscm^-2

(b) The following data was obtained from an experiment to determine the size of a palm oil molecule.
— Volume of 100 drops of palm oil = 15.0mm³
— Area of a patch from one drop of oil = 8.0 X 10⁴ mm²
Determine the size of a palm oil molecule.

From the graph determine;
(i) The spring constant K,
(ii) The load that causes an extension of 3 X 10^-2 m.
(c) Three identical springs of spring constant 100 Nm^-1 are arranged as shown in Figure 5 to support a 5 N load.

(a)Define the term velocity ratio of a machine.
(b) Fig. 12 shows part of a hydraulic press. The plunger is the position where effort is applied while the Ram piston is the position where load is applied. The plunger has cross-section area, a m² while the Ram piston has cross-section area, A m².

b) Water of mass 3.0kg initially at 20⁰C is heated in an electric kettle rated 3.0KW. The water is heated until it boils at 100⁰C. (Take specific heat capacity of water 4200Jkg1K^-1. Heat capacity of the kettle = 450JK^-1, Specific latent heat of vaporization of water = 2.3Mjkg^-1)