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MCQOPTIONS
This section includes 1777 Mcqs, each offering curated multiple-choice questions to sharpen your 9th Class knowledge and support exam preparation. Choose a topic below to get started.
| 251. |
An element \[X\] has two isotopes, which may be represented as \[^{238}X\] and\[^{235}X\]. How does \[^{238}X\] differ from\[^{235}X\]? |
| A. | \[^{238}X\]has \[3\] more protons and \[3\] more electrons than\[235\]. |
| B. | \[^{238}X\] has \[3\] more protons, but same number of electrons as\[235\]. |
| C. | \[^{238}X\] has \[3\] more neutrons, but the electrons or protons are same as\[235\]. |
| D. | \[^{238}X\] has \[3\] more protons, but same number of electrons as\[235\]. |
| Answer» D. \[^{238}X\] has \[3\] more protons, but same number of electrons as\[235\]. | |
| 252. |
In a sinusoidal wave, the time required for a particular point to move from maximum displacement to zero displacement is 0.170s. The frequency of the wave is |
| A. | 1.47 Hz |
| B. | 0.36 Hz |
| C. | 0.73 Hz |
| D. | 2.94 Hz |
| Answer» B. 0.36 Hz | |
| 253. |
Longitudinal waves cannot travel through |
| A. | vacuum |
| B. | solids |
| C. | liquids |
| D. | gases |
| Answer» B. solids | |
| 254. |
Study the given mass spectrum of magnesium carefully. The number of protons in \[^{\text{26}}\text{Mg}\], number of neutrons in \[^{\text{25}}\text{Mg}\], and the relative atomic mass of Mg are respectively |
| A. | 12, 13 and 25 |
| B. | 16, 12 and 24 |
| C. | 14, 13 and 25 |
| D. | 12, 13 and 24.32 |
| Answer» E. | |
| 255. |
Which of the following properties of sound is affected by a change in the air temperature? |
| A. | Frequency |
| B. | Amplitude |
| C. | Intensity |
| D. | Wavelength |
| Answer» E. | |
| 256. |
A does \[500\,\,J\] of work in \[10\] minutes and \[B\] does \[600\,\,J\] of work in \[20\] minutes. The power delivered by \[A\] and \[B\] is \[{{P}_{1}}\] and \[{{P}_{2}}\] respectively. Find the relation between\[{{P}_{1}}\]and\[{{P}_{2}}\]. |
| A. | \[{{P}_{1}}={{P}_{2}}\] |
| B. | \[{{P}_{1}}>{{P}_{2}}\] |
| C. | \[{{P}_{1}}<{{P}_{2}}\] |
| D. | \[{{P}_{1}}\]and\[{{P}_{2}}\]are undefined |
| Answer» C. \[{{P}_{1}}<{{P}_{2}}\] | |
| 257. |
The example of a pair of isobar is |
| A. | \[_{1}{{\text{H}}^{1}}\,\text{and}{{\,}_{1}}{{H}^{2}}\] |
| B. | \[_{1}{{\text{H}}^{2}}\,\text{and}{{\,}_{1}}{{H}^{3}}\] |
| C. | \[_{1}{{\text{H}}^{3}}\,\text{and}{{\,}_{2}}H{{e}^{3}}\] |
| D. | \[_{1}\text{H}{{\text{e}}^{3}}\,\text{and}{{\,}_{1}}H{{e}^{4}}\] |
| Answer» D. \[_{1}\text{H}{{\text{e}}^{3}}\,\text{and}{{\,}_{1}}H{{e}^{4}}\] | |
| 258. |
Two bodies of unequal masses possess the same momentum. Which of the following can be concluded? |
| A. | Heavier mass possesses lesser\[K.E.\] |
| B. | The masses of the two bodies are in the direct ratio of their velocities. |
| C. | Lighter mass possesses less\[K.E.\] |
| D. | Both [a] and [b] |
| Answer» B. The masses of the two bodies are in the direct ratio of their velocities. | |
| 259. |
How are the two atoms\[_{92}^{235}P\] and\[_{92}^{238}P\]similar? |
| A. | Only (i) |
| B. | Only (i) and (ii) |
| C. | Only (i) and (iii) |
| D. | (i), (ii) and (iii) |
| Answer» D. (i), (ii) and (iii) | |
| 260. |
In ordinary talk, amplitude of the vibration approximately |
| A. | \[\text{1}0.\text{7}\]metres |
| B. | \[\text{1}0.\text{9}\]metres |
| C. | \[\text{1}0.\text{11}\]metres |
| D. | \[\text{1}0.\text{13}\]metres |
| Answer» C. \[\text{1}0.\text{11}\]metres | |
| 261. |
Which one of the following is likely to be a pure substance? |
| A. | A colour less liquid having boiling point \[60{}^\circ C\] to \[70{}^\circ C\] |
| B. | A green solid having melting point \[80{}^\circ C\] to \[110{}^\circ C\] |
| C. | Chromatograph of a white solid which gives only one spot |
| D. | A brown liquid soluble in water. |
| E. | None of these |
| Answer» D. A brown liquid soluble in water. | |
| 262. |
Select the odd one out among the following on the basis of mode of transmission. |
| A. | AIDS |
| B. | Syphilis |
| C. | Gonorrhoea |
| D. | Rabies |
| Answer» E. | |
| 263. |
Force centripetal force given by Newton?s second law is: |
| A. | \[\frac{m{{v}^{2}}}{r}\] |
| B. | \[\frac{mv}{r}\] |
| C. | \[\frac{mv}{{{r}^{2}}}\] |
| D. | \[\frac{2mv}{{{r}^{2}}}\] |
| E. | None of these |
| Answer» B. \[\frac{mv}{r}\] | |
| 264. |
Water is falling at the rate of \[1000\,\,kg\] per second. The height of the fall is about\[100\,\,m\]. The potential energy of water when it falls on the blades will be conveyed to them and \[P.E.\] is converted into \[K.E.\] of blades. Estimate the power that could be generated, if energy is not lost otherwise (Take the value of gas\[10\,\,m{{s}^{-2}}\]). |
| A. | \[10\,\,W\] |
| B. | \[100\,\,W\] |
| C. | \[{{10}^{6}}W\] |
| D. | \[{{10}^{5}}W\] |
| Answer» D. \[{{10}^{5}}W\] | |
| 265. |
Read the given statements and select the correct option.Statement 1: Echo is produced when sound is incident on hard and polished surface.Statement 2: Sound energy can be totally reflected by objects with soft and loose texture. |
| A. | Both statements 1 and 2 are true and statement 2 is the correct explanation of statement 1. |
| B. | Both statements 1 and 2 are true but statement 2 is not the correct explanation of statement 1. |
| C. | Statement 1 is true but statement 2 is false. |
| D. | Both statements 1 and 2 are false. |
| Answer» D. Both statements 1 and 2 are false. | |
| 266. |
Pitch or shrillness of sound depends on |
| A. | frequency |
| B. | amplitude of vibrations |
| C. | both (a) and (b) |
| D. | none of these |
| Answer» B. amplitude of vibrations | |
| 267. |
Which of the following quantities is always in whole number? |
| A. | Atomic radius |
| B. | Atomic number |
| C. | Mass number |
| D. | Equivalent weight |
| Answer» C. Mass number | |
| 268. |
Which of the following is sensitive to \[\mathbf{S}{{\mathbf{O}}_{\mathbf{2}}}\] pollution? |
| A. | Fungus |
| B. | Algae |
| C. | Lichens |
| D. | Nitrosomonas |
| E. | None of these |
| Answer» D. Nitrosomonas | |
| 269. |
The distance between two consecutive points in the same phase is called |
| A. | pitch |
| B. | velocity |
| C. | wavelength |
| D. | period |
| Answer» D. period | |
| 270. |
Two sister chromatids of a chromosomes are attached with: |
| A. | Gene |
| B. | Chromatin |
| C. | Nucleus |
| D. | Centromere |
| E. | None of these |
| Answer» E. None of these | |
| 271. |
Pulse polio immunisation programme was launched with an aim to eradicate polio disease. It involves simultaneous administration of polio drops (polio vaccine) to the high risk population on a single day throughout the nation. What is the basic objective of pulse polio immunisation programme? |
| A. | To immunise those children who are not earlier immunised or are partially immunised. |
| B. | To boost the immunity of children already immunised. |
| C. | To eradicate the polio-causing virus from the world. |
| D. | All of these |
| Answer» E. | |
| 272. |
The approximate hearing ranges of some species are listed in the given table. Species Hearing range (Hz) Human 20-20 000 Cat 45-60 000 Rabbit 360-40 000 Tuna 50-1 000 Ferret 16-45 000 Bullfrog 100-3 000 The frequency of the sound produced by a flute is 200 Hz. Which of the given species cannot hear this sound? |
| A. | Cat |
| B. | Tuna |
| C. | Rabbit |
| D. | Bullfrog |
| Answer» D. Bullfrog | |
| 273. |
Number of electrons in one mole of hydrogen is |
| A. | \[\text{6}.0\text{23 }\times \text{ 1}{{0}^{\text{23}}}\] |
| B. | \[\text{12}.0\text{46 }\times \text{ 1}{{0}^{\text{23}}}\] |
| C. | \[\text{3}.0\text{115 }\times \text{ 1}{{0}^{\text{23}}}\] |
| D. | indefinite |
| Answer» C. \[\text{3}.0\text{115 }\times \text{ 1}{{0}^{\text{23}}}\] | |
| 274. |
10.0 g of\[\text{CaC}{{\text{O}}_{\text{3}}}\] on heating gave \[\text{4}\text{.4 g}\]of \[\text{C}{{\text{O}}_{\text{2}}}\]and 5.6 g of\[CaO\]. The observation is in agreement with the |
| A. | law of constant composition |
| B. | law of multiple proportion |
| C. | law of reciprocal proportion |
| D. | law of conservation of mass |
| Answer» E. | |
| 275. |
What will be the ratio of \[c{{l}^{35}}\]and \[c{{l}^{37}}\]respectively in ordinary chlorine if the atomic weight of chlorine is 35.5? |
| A. | 1 : 3 |
| B. | 3 : 1 |
| C. | 1 : 2 |
| D. | 2 : 1 |
| Answer» C. 1 : 2 | |
| 276. |
A gaseous mixture contains oxygen and nitrogen in the ratio of 1: 4 by weight. Therefore, the ratio of their number of molecules is |
| A. | 1 : 4 |
| B. | 1 : 8 |
| C. | 7 : 32 |
| D. | 3 : 16 |
| Answer» D. 3 : 16 | |
| 277. |
A balanced chemical equation is in accordance with |
| A. | Avogadro's Law |
| B. | Law of constant proportion |
| C. | Law of conservation of mass |
| D. | Law of gaseous volumes |
| Answer» D. Law of gaseous volumes | |
| 278. |
Number of molecules in one litre of water is close to |
| A. | \[\frac{6.023}{23.4}\times {{10}^{23}}\] |
| B. | \[\text{18 }\times \text{ 6}.0\text{23 }\times \text{ 1}{{0}^{\text{23}}}\] |
| C. | \[\frac{18}{22.4}\times {{10}^{23}}\] |
| D. | \[\text{55}.\text{5 }\times \text{ 6}.0\text{23 }\times \,\,\text{1}{{0}^{\text{23}}}\] |
| Answer» E. | |
| 279. |
1 g of an oxide of A contained 0.5 g of A, 4 g of another oxide of A contained 1.6 g of A. These figures illustrate the law of |
| A. | conservation of mass |
| B. | reciprocal proportions |
| C. | multiple proportions |
| D. | constant proportions |
| Answer» D. constant proportions | |
| 280. |
The law of multiple proportion was discovered by |
| A. | John Dalton |
| B. | Richter |
| C. | Joseph Proust |
| D. | A. Lavoisier |
| Answer» B. Richter | |
| 281. |
Which of the following samples contain the smallest number of atoms? |
| A. | \[\text{1 g of C}{{\text{O}}_{\text{2}}}\text{ }\left( \text{g} \right)\] |
| B. | \[\text{1 g of }{{\text{C}}_{8}}{{\text{H}}_{18}}\left( 1 \right)\] |
| C. | \[\text{1 g of }{{\text{C}}_{2}}{{\text{H}}_{6}}\left( g \right)\] |
| D. | \[\text{1 g of LiF}\left( S \right)\] |
| Answer» B. \[\text{1 g of }{{\text{C}}_{8}}{{\text{H}}_{18}}\left( 1 \right)\] | |
| 282. |
The substance which gives colloidal solution in water is |
| A. | sugar |
| B. | soap |
| C. | alum |
| D. | plaster of parts |
| Answer» C. alum | |
| 283. |
The number of gram molecules of oxygen in \[\text{6}.0\text{2 }\times \text{ 1}{{0}^{\text{24}}}\] CO molecules is |
| A. | 10 g molecules |
| B. | 5g molecules |
| C. | 1g molecule |
| D. | 0.5 molecule |
| Answer» E. | |
| 284. |
What is the total number of atoms present in 25.0 mg of camphor, \[{{C}_{10}}{{H}_{16}}O\] ? |
| A. | \[~\text{9}.\text{89 }\times \text{ 1}{{0}^{\text{19}}}\] |
| B. | \[\text{2}.\text{67 }\times \text{ 1}{{0}^{\text{21}}}\] |
| C. | \[\text{6}.0\text{2 }\times \text{ 1}{{0}^{\text{2}0}}\] |
| D. | \[\text{2}.\text{57 }\times \text{ 1}{{0}^{\text{21}}}\] |
| Answer» C. \[\text{6}.0\text{2 }\times \text{ 1}{{0}^{\text{2}0}}\] | |
| 285. |
Equivalent weight of crystalline oxalic acid is |
| A. | 90 |
| B. | 63 |
| C. | 53 |
| D. | 45 |
| Answer» C. 53 | |
| 286. |
Liquid drops assume spherical shape because |
| A. | A sphere has maximum surface area |
| B. | A sphere has minimum surface area |
| C. | Sphere is symmetrical in shape |
| D. | None of these |
| Answer» C. Sphere is symmetrical in shape | |
| 287. |
Artificial rain based on the principle of |
| A. | Coagulation |
| B. | Electro phroetic effect |
| C. | Emulsification |
| D. | Tyndall effect |
| Answer» B. Electro phroetic effect | |
| 288. |
A sample of pure water, irrespective of source, contains 88.89% oxygen and 11.11% hydrogen by mass. The data supports the |
| A. | law of conservation of mass |
| B. | law of constant composition |
| C. | law of multiple proportion |
| D. | law of reciprocal proportion |
| Answer» C. law of multiple proportion | |
| 289. |
If two compounds have the same empirical formula but different molecular formula, they must have |
| A. | Different percentage composition |
| B. | Different molecular weight |
| C. | Same viscosity |
| D. | Same vapour density |
| Answer» C. Same viscosity | |
| 290. |
4.0 grams of caustic soda contains |
| A. | \[\text{6}.0\text{2 }\times \text{l}{{0}^{\text{23}}}\text{ atoms of H}\] |
| B. | 4 g atoms of Na |
| C. | \[\text{6}.0\text{2 }\times \text{ 1}{{0}^{\text{23}}}\text{ atoms of Na}\] |
| D. | \[\text{4 moles of NaOH}\] |
| Answer» D. \[\text{4 moles of NaOH}\] | |
| 291. |
Number of gram-atoms in 8 g of He are |
| A. | 2 |
| B. | \[\text{1}.\text{2}0\text{4 }\times \text{ 1}{{0}^{\text{24}}}\] |
| C. | \[\text{3}.\text{1}0\text{ }\times \text{ 1}{{0}^{\text{23}}}\] |
| D. | None of these |
| Answer» B. \[\text{1}.\text{2}0\text{4 }\times \text{ 1}{{0}^{\text{24}}}\] | |
| 292. |
Empirical formula of a compound is\[C{{H}_{2}}O\]. Its molecular mass is 60. The molecular formula will be |
| A. | \[C{{H}_{2}}O\] |
| B. | \[{{C}_{2}}{{H}_{4}}{{O}_{2}}\] |
| C. | \[{{C}_{3}}{{H}_{6}}{{O}_{3}}\] |
| D. | None of these |
| Answer» C. \[{{C}_{3}}{{H}_{6}}{{O}_{3}}\] | |
| 293. |
The mass of an atom of nitrogen is |
| A. | \[\frac{14}{6.023\times {{10}^{23}}}g\] |
| B. | \[\frac{28}{6.023\times {{10}^{23}}}g\] |
| C. | \[\frac{1}{6.023\times {{10}^{23}}}g\] |
| D. | \[14\,a.m.u.\] |
| Answer» B. \[\frac{28}{6.023\times {{10}^{23}}}g\] | |
| 294. |
Active mass of 6% solution of compound \[\text{X}\] is 2. Molecular weight of \[\text{X}\] would be |
| A. | 6 |
| B. | 30 |
| C. | 60 |
| D. | 90 |
| Answer» C. 60 | |
| 295. |
Number of ions in one litre of pure water is |
| A. | \[\text{6}.0\text{23 }\times \text{ 1}{{0}^{\text{23}}}\] |
| B. | \[\text{6}.0\text{23 }\times \text{ 1}{{0}^{\text{16}}}\] |
| C. | \[\text{3}.0\text{2 }\times \text{ l}{{0}^{\text{23}}}\] |
| D. | \[1\times \text{1}{{\text{0}}^{-\text{7}}}\] |
| Answer» C. \[\text{3}.0\text{2 }\times \text{ l}{{0}^{\text{23}}}\] | |
| 296. |
Number of moles of water in 1.8 litre of pure water is (Density of water = 1 g/ml) |
| A. | 18 |
| B. | 100 |
| C. | 36 |
| D. | 55.4 |
| Answer» C. 36 | |
| 297. |
Which of the following has smallest number of molecules? |
| A. | \[0.1\,\,mole\,\,of\,C{{O}_{2}}\,gas\] |
| B. | \[\text{11}\text{.2 litres of C}{{\text{O}}_{\text{2}}}\text{ gas}\] |
| C. | \[\text{22 gm of C}{{\text{O}}^{\text{2}}}\text{ gas}\] |
| D. | \[\text{22}.\text{4 }\times \text{ 1}03\,\,\,\text{ml of C}{{\text{O}}^{\text{2}}}\text{ gas}\] |
| Answer» B. \[\text{11}\text{.2 litres of C}{{\text{O}}_{\text{2}}}\text{ gas}\] | |
| 298. |
Number of water molecules in one litre of pure water is |
| A. | \[\text{6}.0\text{23 }\times \text{ 1}{{0}^{\text{23}}}\] |
| B. | \[\text{3}.\text{45 }\times \text{ 1}{{0}^{\text{25}}}\] |
| C. | \[\text{55}.\text{4 }\times \text{ 1}{{0}^{\text{23}}}\] |
| D. | \[\text{18 }\times \text{ 1}{{0}^{\text{23}}}\] |
| Answer» C. \[\text{55}.\text{4 }\times \text{ 1}{{0}^{\text{23}}}\] | |
| 299. |
The emperical formula of sucrose is |
| A. | \[C{{H}_{2}}O\] |
| B. | CHO |
| C. | \[{{C}_{12}}{{H}_{22}}{{O}_{11}}\] |
| D. | \[C{{({{H}_{2}}O)}_{2}}\] |
| Answer» D. \[C{{({{H}_{2}}O)}_{2}}\] | |
| 300. |
On heating a liquid, its surface tension |
| A. | increases |
| B. | decreases |
| C. | ramains same |
| D. | is reduced to zero |
| Answer» C. ramains same | |