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

Which quantity can be measured directly using a micrometer screw gauge?

2019 Summer

1

MCQ

CH2 - FORCES AND MOTION

The velocity of an object increases from 30 m/s to 50 m/s in 5.0 seconds.What is the average acceleration of the object?

2019 Summer

1

MCQ

CH2 - FORCES AND MOTION

A heavy metal ball falls vertically downwards through air past four equally spaced levels J, K, L and M.The times taken to fall from one level to the ...

2019 Summer

1

MCQ

CH2 - FORCES AND MOTION

A body is moved from place X to place Y where the gravitational field strength is different. What happens to its mass and to its weight due to the mov...

2019 Summer

1

MCQ

CH1 - MEASUREMENTS AND UNITS

The diagrams show four solid blocks with their dimensions and masses.Which block has the greatest density?

2019 Summer

1

MCQ

CH3 - FORCES AND PRESSURE

A student wishes to determine the spring constant of a spring where it obeys Hooke’s law. Different loads are hung from the spring and its length is...

2019 Summer

1

MCQ

CH2 - FORCES AND MOTION

A mass of 20 kg is held stationary by a rope passing over a frictionless pulley. What is the tension $T$ in the rope?

2019 Summer

2

MCQ

CH2 - FORCES AND MOTION

A boat starts moving across a river at velocity $v$ perpendicular to the river bank. The boat encounters a current along the river of velocity $u$, as...

2019 Summer

1

MCQ

CH2 - FORCES AND MOTION

A ball of mass 0.50 kg falls and hits the floor at 10 m/s. It rebounds at speed 8.0 m/s, as shown. The collision between the ball and the floor las...

2019 Summer

1

MCQ

CH4 - FORCES AND ENERGY

An object falls from the top of a building that is 25 m high. Air resistance is negligible.What is the speed of the object when it hits the ground?

2019 Summer

3