One joule of work is said to be done when________

• a force of 1 dyne causes a displacement of 1 cm

• a force of 1 dyne causes a displacement of 1 m

• a force of 1 N causes a displacement of 1 cm

• a force of 1 N causes a displacement of 1 m

_{Radioactive emission of which of the following particles would change mass number as well as atomic number?}

_{1)Gamma particle}

_{2)Beta particle}

_{3)Alpha particle}

_{Select the correct option from the options given below:}

• Only 1 & 2

• Only 2 & 3

• Only 3

• None of the above

What do electrons constantly do?

• They pop in and out of appearing.

• They pop in and out of existence.

• They pop in and out of consciousness.

• They pop in and out of disappearing.

Which subatomic particle is negatively charged?

• proton

• neutron

• electron

• quark

What are undulations of waves?

• Left and right movements.

• Up and left movements.

• Down and right movements.

• Up and down movements.