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

A pendulum makes 50 complete swings in 2 min 40 s. What is the time period for 1 complete swing?

2020 Summer

1

MCQ

CH2 - FORCES AND MOTION

A student investigates the motion of a ball rolling down a slope.The diagram shows the speed $v$ of the ball at different times $t$.Which statement de...

2020 Summer

1

MCQ

CH2 - FORCES AND MOTION

Which statement about acceleration is correct?

2020 Summer

2

MCQ

CH2 - FORCES AND MOTION

Which statement correctly describes the effects of placing a heavy load in a car?

2020 Summer

1

MCQ

CH2 - FORCES AND MOTION

A mass of 6.0 kg rests on the surface of a planet.On this planet, $g = 20 \text{ N/kg}$.What is the weight of the object?

2020 Summer

1

MCQ

CH1 - MEASUREMENTS AND UNITS

The mass of a measuring cylinder is 190 g.400 cm3 of liquid is put into the measuring cylinder.The total mass of the measuring cylinder and the liquid...

2020 Summer

1

MCQ

CH3 - FORCES AND PRESSURE

The diagram shows a wooden beam PQ, of negligible weight, which is attached to a wall by a hinge at P and kept in a horizontal position by a vertical ...

2020 Summer

1

MCQ

CH2 - FORCES AND MOTION

Which quantity is a vector?

2020 Summer

1

MCQ

CH2 - FORCES AND MOTION

An object of mass 1.2 kg is moving with a velocity of 2.0 m/s when it is acted on by a force of 4.0 N. The velocity of the object increases to 5.0 m/s...

2020 Summer

MCQ

CH4 - FORCES AND ENERGY

The diagram shows part of a rollercoaster ride with the car at different positions. The car runs freely down from position X to position Y and up the ...

2020 Summer

1