Theory

CH11 - ATOMS AND RADIOACTIVITY

A certain element is known to exist as two different isotopes.(a) State one thing that is the same for atoms of both isotopes............................

2010 Summer

2

Theory

CH11 - ATOMS AND RADIOACTIVITY

Emissions from a radioactive source pass through a hole in a lead screen and into a magnetic field, as shown in Fig. 10.1. Radiation detectors are p...

2010 Winter

2

Theory

CH11 - ATOMS AND RADIOACTIVITY

(a) An atom consists of a nucleus made up of protons and neutrons, surrounded by orbiting electrons.(i) Which of these particles has a positive charge...

2011 Summer

2

Theory

CH11 - ATOMS AND RADIOACTIVITY

A scientist needs to use a source of $\gamma$-rays as safely as possible.Which action will not reduce the amount of radiation that reaches the scienti...

2011 Winter

2

Theory

CH11 - ATOMS AND RADIOACTIVITY

A nuclide of substance X has the symbol $^{26}_{12}X$.How many electrons are there in a neutral atom of substance X?A. 12 B. 14 C. 26 D. 38

2011 Winter

2

Theory

CH11 - ATOMS AND RADIOACTIVITY

The graph shows the activity of a radioactive source over a period of time. What is the half-life of the source? A $\frac{1}{2}$ hour B 1 hour C ...

2011 Winter

3

Theory

CH11 - ATOMS AND RADIOACTIVITY

A radioactive nucleus contains 138 neutrons. The nucleus emits an \( \alpha \)-particle. How many neutrons are in the nucleus after it has emitted th...

2009 Summer

2

Theory

CH11 - ATOMS AND RADIOACTIVITY

The graph shows the decay curve for one particular radioactive nuclide. What is the half-life of this nuclide? A. 1.0 day B. 1.5 days C. 2.0 days D. ...

2009 Summer

2

Theory

CH11 - ATOMS AND RADIOACTIVITY

Which diagram could represent the structure of a neutral atom?[Image_1: Diagrams A, B, C, and D with key indicating neutron, proton, electron]

2012 Summer

2

Theory

CH11 - ATOMS AND RADIOACTIVITY

A radioactive element has a half-life of 70s.The number of emissions per second, $N$, of a sample of the element is measured at a certain time.What wa...

2010 Winter

2

Theory

CH1 - MEASUREMENTS AND UNITS

A student wishes to measure accurately the volume of approximately 40 cm³ of water. She has two measuring cylinders, a larger one that can hold 100 c...

2014 Summer

1

Theory

CH2 - FORCES AND MOTION

Which distance/time graph represents the motion of an object moving at constant speed? [Image_1: Graphs A, B, C, D with axes for distance and time]

2014 Summer

1

Theory

CH2 - FORCES AND MOTION

The graph shows how the speed of a car changes with time. Which calculation gives the distance travelled by the car in 24 seconds?A. $\left(\frac{14}{...

2014 Summer

3

Theory

CH1 - MEASUREMENTS AND UNITS

Which instrument is used to compare the masses of objects? A. a balance B. a barometer C. a manometer D. a measuring cylinder

2014 Summer

1

Theory

CH1 - MEASUREMENTS AND UNITS

A liquid has a volume of $100 \text{cm}^3$ and a mass of $85 \text{g}$.The density of water is $1.0 \text{g/cm}^3$.How does the density of the liquid ...

2014 Summer

2

Theory

CH3 - FORCES AND PRESSURE

A plane lamina with centre of mass X touches the ground at point P.Which diagram shows the lamina in equilibrium?

2014 Summer

6

Theory

CH3 - FORCES AND PRESSURE

A student adds weights to an elastic cord. He measures the length of the cord for each weight.He then plots a graph from the results, as shown.What ha...

2014 Summer

1

Theory

CH4 - FORCES AND ENERGY

Which energy transfer takes place when a matchstick burns?A. chemical to thermalB. chemical to nuclearC. nuclear to chemicalD. thermal to chemical

2014 Summer

1

Theory

CH4 - FORCES AND ENERGY

Four cars are driven along a road.The table shows the work done by the engine in each car and the time taken by each car.Which engine produces the mos...

2014 Summer

1

Theory

CH3 - FORCES AND PRESSURE

Which situation is an example of a force acting over a large area to produce a small pressure?A. a builder hammering a nail into a piece of woodB. a c...

2014 Summer

1