Positive Rays and Neutrons

Q.

The atoms of different elements with the same mass number, but different atomic numbers are called ________.

Q.

The mass of electron, proton and neutron in grams are

Q.

Atoms consists of protons, neutrons and electrons. If the mass of neutrons and electrons were made half and two times respectively to their actual masses, then the atomic mass of ${}_6{C}^{12}$

1. Will remain approximately the same

2. Will become approximately two times

3. Will remain approximately half

4. Will be reduced by 25%

Q. 19.Why e/m ratio of proton varies ? (It should be same because mass and charge on proton is same in all so charge by mass ratio should not vary

Q.

Who discovered the fundamental subatomic particle neutron?

Q. 22. A proton and an alpha particle accelerated through some potential difference in ratio 2:1. The ratio of de broglie wavelength associated with proton to that of alpha particle is

Q. 23 How Ortho and para positions become the centres for high electron density?

Q.

Uncertainty in the position of an electron (mass 9.1 x 10^-31 kg) moving with a velocity of 300 ms^-1, accurate upto 0.001% will be:

1. 5.76 x 10^-2 m

2. 1.93 x 10^-2 m

3. 3.84 x 10^-2 m

4. 19.2 x 10^-2 m

Q. write the electronic configuration of Cu²⁺, H^-, Fe³⁺, Mn^​2+, Cr³⁺
also, find the ion having
1. maximum number of protons
2. maximum number of neutrons
3. maximum number of unpaired electrons.

Q. A light paddle wheel is placed in the path of cathode rays in a cathode ray discharge tube experiment and it was found that cathode rays rotate the paddle wheel.


This observation leads to which of the following conclusions:

1. Cathode rays are negatively charged
2. Cathode rays are positively charged
3. Cathode rays contain material particles having both mass and velocity
4. All of the above

Q. Why is Relative Atomic Mass always a decimal or fractional number, As an electron cannot be half or quarter in an atom?

Q. The lightest particle among the following is:

1. $\alpha$ particle
2. Positron
3. Proton
4. Neutron

Q. Total number of protons in $10$ g of calcium carbonate is :

1. $4.06\times {10}^{24}$
2. $3.24\times {10}^{24}$
3. $3.01\times {10}^{24}$
4. $2.01\times {10}^{24}$

Q.

The nature of anode rays depends on the nature of residual gases

1. True
2. False

Q.

What are isobars?

Q.

When beryllium is bombarded with $\alpha$ - particles, extremely penetrating radiations which cannot be deflected by electrical or magnetic field are given out. These are

1. A beam of protons

2. $\alpha$ - rays

3. A beam of neutrons
4. X-rays

Q. Atoms contain protons, neutrons and electrons. The mass of a neutron is assumed to be half of its original value while that of an electron is assumed to be twice of the original value. Calculate the change in atomic mass of carbon ($C^{12}$).

1. 25 % more
2. 75 % less
3. 25 % less
4. 50 % more

Q. Find the ratio of $\frac{e}{m}$ of an alpha particle to to that of a neutron.

1. $0$
2. $\infty$
3. $1$
4. $2$

Q. Which of the following statements is correct regarding canal rays?

1. The mass of the positive rays depends on the atomic weights or molecular weights of the gases in the discharge tube.
2. The deflection of positive rays under the influence of an electric and magnetic fields is smaller than that of the cathode rays
3. Canal rays travel from the positive electrode to the negative electrode
4. All of the above

Q. Which of the following is not a characteristic of anode rays?

1. Anode rays travel in a straight line in the absence of electric and magnetic field
2. The impact of electric and magnetic fields is opposite to the impact on cathode ray
3. The properties of anode rays does not depend on the nature of the gas taken in the discharge tube
4. Anode rays possess a positive charge

Q.

Name or state the following:

Elements having same mass number but different atomic number.

Q. Neutrons were discovered by:

1. Bombarding thin sheets of beryllium with alpha particles
2. Bombarding thin sheets of calcium with beta particles
3. By radiating X-rays on an alpha particle
4. Bombarding thin sheets of calcium with alpha particles

Q. Neutrons were discovered by:

1. Bombarding thin sheets of calcium with alpha particles
2. Bombarding thin sheets of calcium with beta particles
3. Bombarding thin sheets of beryllium with alpha particles
4. By radiating X-rays on an alpha particle

Q. Deflection of the cathode rays produced in discharge tube in presence of external electric field is represented by the given diagram.
Identify the correct statement for the following system.

1. Upper terminal is positive terminal
2. Lower terminal is positive terminal
3. Lower terminal is negative terminal
4. Can not be predicted

Q. The total number of protons present in 124 g of $N{O}_3^{-}$ are:

1. $124N_A$
2. $62N_A$
3. $31N_A$
4. $62N_A$

Q. Total number of protons in $10$ g of calcium carbonate is :

1. $4.06\times {10}^{24}$
2. $3.01\times {10}^{24}$
3. $3.24\times {10}^{24}$
4. $2.01\times {10}^{24}$

Q. The statements that is/are correct among the following is

1. $e^{-}>H^{+}>H{e}^{2+}$ ( The order of charge/mass)
2. Nature of cathode rays produced from He and H will be different
3. Nature of canal rays produced from He and H will be different
4. The charge by mass ratio of canal rays produced from H and He gases will be different.

Q. The increasing order for the magnitude of e/m (charge/mass) for an electron (e), proton (p), neutron (n) and an alpha-particle ($\alpha$) is:

1. e < p < n < $\alpha$
2. n < p < e < $\alpha$
3. n < $\alpha$ < p < e
4. n < p < $\alpha$ < e

Q. The increasing order for the magnitude of e/m (charge/mass) for an electron (e), proton (p), neutron (n) and an alpha-particle ($\alpha$) is:

1. e < p < n < $\alpha$
2. n < p < e < $\alpha$
3. n < $\alpha$ < p < e
4. n < p < $\alpha$ < e

Q. the charge to mass ratio of Alpha particle is approximately to the charge to mass ratio of proton is