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

MCQ

CH1 - MEASUREMENTS AND UNITS

The diagram shows an enlarged drawing of the end of a metre rule. It is being used to measure the length of a small feather. What is the length of th...

2016 Summer

1

MCQ

CH2 - FORCES AND MOTION

The speed-time graph shown is for a car moving in a straight line. What is the acceleration of the car when the time is 40s?

2016 Summer

1

MCQ

CH2 - FORCES AND MOTION

Two runners take part in a race. The graph shows how the speed of each runner changes with time. What does the graph show about the runners at time $t...

2016 Summer

1

MCQ

CH2 - FORCES AND MOTION

A satellite orbits the Earth above the atmosphere at a constant speed. The diagram shows the satellite at one point in its circular orbit around the E...

2016 Summer

1

MCQ

CH2 - FORCES AND MOTION

A cup contains hot liquid.Some of the liquid evaporates.What happens to the mass and what happens to the weight of the liquid in the cup?[Table_1]

2016 Summer

1

MCQ

CH3 - FORCES AND PRESSURE

The diagrams show three uniform beams P, Q, and R, each pivoted at its centre. The two forces acting on each beam are also shown. Which beams rotate c...

2016 Summer

1

MCQ

CH2 - FORCES AND MOTION

An object of mass 50 kg accelerates from a velocity of 2.0 m/s to a velocity of 10 m/s in the same direction.What is the impulse provided to cause thi...

2016 Summer

1

MCQ

CH2 - FORCES AND MOTION

A scalar quantity has

2016 Summer

1

MCQ

CH4 - FORCES AND ENERGY

Energy is released in some nuclear reactions. Which nuclear reaction takes place in a nuclear power station, and which nuclear reaction takes place in...

2016 Summer

1

MCQ

CH4 - FORCES AND ENERGY

A lorry of mass 4000 kg is travelling at a speed of 4.0 m/s. A car has a mass of 1000 kg. The kinetic energy of the car is equal to the kinetic energ...

2016 Summer

1