True-False [Che-1M]

Question 11 Mark

State whether the following statements are true or false:
Thomson proposed that the nucleus of an atom contains protons and neutrons.

Answer

False.

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Question 21 Mark

State whether the following statements are true or false:
The cathode rays obtained from all the gases consist of negatively charged particles called electrons.

Answer

True.

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Question 31 Mark

State whether the following statements are true or false:
The anode rays obtained from all the gases consist of positively charged particles called protons.

Answer

False.

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Question 41 Mark

State whether the following statement is true or false:
Radioactive isotope of iodine is used for making the medicine called tincture iodine.

Answer

The given statement is false.

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Question 51 Mark

$\alpha-$Particles are positively charged.

Answer

True.
Explanation:
An The alpha particle is a helium nucleus; it consists of two protons and two neutrons. It contains no electrons to balance the two positively charged protons. Alpha particles are therefore positively charged particles moving at high speeds. Beta particles are emitted by neutron rich unstable nuclei.

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Question 61 Mark

Most part of the atom is hollow.

Answer

True.
Explanation:
An atom, in which many electrons are located in the outer electron shells while many inner electron states are empty, is called a "hollow atom".

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Question 71 Mark

For the following statements, write T for True and F for False.
The mass of an electron is about $\frac{1}{2000}$ times that of proton.

Answer

True.
Explanation:
The mass of an electron is about $\frac{1}{2000}$ times that of proton.

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Question 81 Mark

For the following statements, write T for True and F for False.

An isotope of iodine is used for making tincture iodine, which is used as a medicine.

Answer

True.
Explanation:
An isotope of iodine is used for making tincture iodine, which is used as a medicine.

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Question 91 Mark

For the following statements, write T for True and F for False.

A neutron is formed by an electron and a proton combining together. Therefore, it is neutral.

Answer

False.
Explanation:
A neutron is formed by an electron and a proton combining together. Therefore, it is neutral.

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Question 101 Mark

For the following statements, write T for True and F for False.
J.J. Thomson proposed that the nucleus of an atom contains only nucleons.

Answer

False.
Explanation:
J.J. Thomson proposed that the nucleus of an atom contains only nucleons.

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Science True-False [Che-1M]

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