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

What is the most accurate and precise method to measure the thickness of a coin?

2017 Summer

1

MCQ

CH2 - FORCES AND MOTION

On Earth, a ball is dropped and falls 2.0 m in a vacuum.The acceleration of the ball at 1.0 m is 10 m/s².What is the acceleration of the ball at 0.5 ...

2017 Summer

1

MCQ

CH2 - FORCES AND MOTION

A skydiver reaches terminal velocity. Then he opens his parachute.What happens to the skydiver as the parachute opens?

2017 Summer

1

MCQ

CH2 - FORCES AND MOTION

A piece of steel is taken from the Earth to the Moon for an experiment. The gravitational field strength on the Moon is smaller than on the Earth.Whic...

2017 Summer

1

MCQ

CH1 - MEASUREMENTS AND UNITS

A measuring cylinder containing only water is placed on an electronic balance. A small, irregularly shaped stone is now completely immersed in the wat...

2017 Summer

1

MCQ

CH2 - FORCES AND MOTION

A boat is travelling at a steady speed in a straight line across the surface of a lake. Which statement about the boat is correct?

2017 Summer

1

MCQ

CH2 - FORCES AND MOTION

A ball of weight 1.2 N drops through the air at terminal velocity.A sudden gust of wind exerts a horizontal force of 0.5 N on the ball from the left.W...

2017 Summer

1

MCQ

CH3 - FORCES AND PRESSURE

The diagram shows a uniform bridge, 4.0 m long and weighing 10 000 N.The bridge is pivoted at one end. A force at the other end gradually increases un...

2017 Summer

1

MCQ

CH2 - FORCES AND MOTION

A bullet of mass 0.10 kg travels horizontally at a speed of 600 m/s. It strikes a stationary wooden block of mass 1.90 kg resting on a frictionless, h...

2017 Summer

1

MCQ

CH4 - FORCES AND ENERGY

A box of mass $m$ slides down a slope of length $l$ and vertical height $d$ against a frictional force $F$.As the box slides down the slope, it loses ...

2017 Summer

1