MCQOPTIONS
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MCQOPTIONS
This section includes 253 Mcqs, each offering curated multiple-choice questions to sharpen your UPSEE knowledge and support exam preparation. Choose a topic below to get started.
| 251. |
The angle made by angular momentum vector of an electron with z axis is given by |
| A. | cosθ = l/m |
| B. | cosθ = √l/m |
| C. | cos θ = √[(l+1)/m ] |
| D. | cosθ = m/√l(l+1) |
| Answer» E. | |
| 252. |
A possible set of quantum numbers for the last electron added to a gallium atom (Z = 31) in its ground state is n l m ms |
| A. | 4 1 –1 +1/2 |
| B. | 4 0 0 –1/2 |
| C. | 3 2 +2 +1/2 |
| D. | 3 0 0 –1/2 |
| Answer» B. 4 0 0 –1/2 | |
| 253. |
Three isotopes of an element have mass numbers M, (M + 1) and (M + 2). If the mean mass number is (M + 0.5) than which of the following ratio may be accepted for M , (M + 1) , (M + 2) in that order. |
| A. | 1 : 1 : 1 |
| B. | 4 : 1 : 1 |
| C. | 3 : 2 : 1 |
| D. | 2 : 1 : 1 |
| Answer» C. 3 : 2 : 1 | |