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.

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

29/7/2020

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.

State two ways in which a mercury based thermometer can be modified to read very small temperature changes.

K.C.S.E Physics Q & A - MODEL 2018PP1QN12

K.C.S.E Physics Q & A - MODEL 2018PP1QN11

K.C.S.E Physics Q & A - MODEL 2018PP1QN10

K.C.S.E Physics Q & A - MODEL 2018PP1QN09

K.C.S.E Physics Q & A - MODEL 2018PP1QN08

K.C.S.E Physics Q & A - MODEL 2018PP1QN07

A wooden cube of side 0.5 m floats in water fully submerged. Determine the weight of the cube. (density of water = 1 gcm-3).

K.C.S.E Physics Q & A - MODEL 2018PP1QN06

It is observed that a drop of milk carefully put into a cup of water turns the water white after some time. State the reason for this observation.

K.C.S.E Physics Q & A - MODEL 2018PP1QN04

K.C.S.E Physics Q & A - MODEL 2018PP1QN03

K.C.S.E Physics Q & A - MODEL 2018PP1QN02

State the reason why an object on earth has a higher weight than on the moon.

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 2017PP1QN13

K.C.S.E Physics Q & A - MODEL 2017PP1QN12

K.C.S.E Physics Q & A - MODEL 2017PP1QN11

A student who wanted to take a bath mixed 4 kg of water at 80 oc with 6 kg of water at 20 oc. Determine the final temperature of the water.

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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.

A wooden cube of side 0.5 m floats in water fully submerged. Determine the weight of the cube. (density of water = 1 gcm^-3).

(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 student who wanted to take a bath mixed 4 kg of water at 80 ^oc with 6 kg of water at 20 ^oc.
Determine the final temperature of the water.