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

1

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

1

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

1

MCQ

CH1 - MEASUREMENTS AND UNITS

The diagram shows a stone of irregular shape. Which property of the stone can be found by lowering it into a measuring cylinder half-filled with water...

2021 Summer

2

MCQ

CH2 - FORCES AND MOTION

Which row describes speed and velocity? [Table_1]

2021 Summer

MCQ

CH2 - FORCES AND MOTION

Four balls with different masses are dropped from the heights shown. Air resistance may be ignored.Which ball has the smallest average speed?

2021 Summer

MCQ

CH2 - FORCES AND MOTION

An object of mass 2.0 kg is taken from the Earth, where the gravitational field strength is 10 N/kg, to the Moon, where the gravitational field streng...

2021 Summer

MCQ

CH1 - MEASUREMENTS AND UNITS

The mass of an empty flask is 34 g. The volume of liquid added to the flask is $20 \ \text{cm}^3$.The total mass of the flask and the liquid is 50 g.W...

2021 Summer

MCQ

CH2 - FORCES AND MOTION

The extension–load graph for a spring is shown. The unstretched length of the spring is 17.0 cm. When an object is suspended from the spring, the l...

2021 Summer

MCQ

CH2 - FORCES AND MOTION

A cart has a mass of 10 kg. A boy pushes on the cart horizontally with a force of 50 N. The cart accelerates at 0.50 m/s^2.What is the frictional forc...

2021 Summer

1

MCQ

CH2 - FORCES AND MOTION

A ball has a mass of 2.0 kg. The ball approaches a wall at a speed of 3.0 m/s and rebounds at a speed of 1.0 m/s. What is the impulse on the wall?

2021 Summer

MCQ

CH4 - FORCES AND ENERGY

Which situation involves no work being done and no energy being transferred?

2021 Summer

MCQ

CH4 - FORCES AND ENERGY

A student suggests that there are several ways of transferring energy to a small, stationary block of iron on a smooth table. He makes the following s...

2021 Summer