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MCQOPTIONS
This section includes 12583 Mcqs, each offering curated multiple-choice questions to sharpen your Joint Entrance Exam - Main (JEE Main) knowledge and support exam preparation. Choose a topic below to get started.
| 4401. |
In nuclear fission the percentage of mass converted into energy is about [KCET 2002] |
| A. | 10% |
| B. | 0.01% |
| C. | 0.1% |
| D. | 1% |
| Answer» D. 1% | |
| 4402. |
In a material medium, when a positron meets an electron both the particles annihilate leading to the emission of two gamma ray photons. This process forms the basis of an important diagnostic procedure called [AIIMS 2003] |
| A. | MRI |
| B. | PET |
| C. | CAT |
| D. | SPECT |
| Answer» C. CAT | |
| 4403. |
Which one of the following statements about uranium is correct [UPSEAT 2002] |
| A. | \[^{235}U\] is fissionable by thermal neutrons |
| B. | Fast neutrons trigger the fission process in \[n=1\text{ to }n=2\] |
| C. | \[^{238}U\] breaks up into fragments when bombarded by slow neutrons |
| D. | \[n=2\text{ to} n=1\] is an unstable isotope and undergoes spontaneous fission |
| Answer» B. Fast neutrons trigger the fission process in \[n=1\text{ to }n=2\] | |
| 4404. |
The energy liberated on complete fission of 1 kg of \[_{92}{{U}^{235}}\] is (Assume 200 MeV energy is liberated on fission of 1 nucleus) [UPSEAT 2003] |
| A. | \[8.2\times {{10}^{10}}J\] |
| B. | \[8.2\times {{10}^{9}}J\] |
| C. | \[8.2\times {{10}^{13}}J\] |
| D. | \[8.2\times {{10}^{16}}J\] |
| Answer» D. \[8.2\times {{10}^{16}}J\] | |
| 4405. |
The binding energy per nucleon of deuterium and helium atom is 1.1 MeV and 7.0 MeV. If two deuterium nuclei fuse to form helium atom, the energy released is [Pb. PMT 2001; CPMT 2001; AIEEE 2004] |
| A. | 19.2 MeV |
| B. | 23.6 MeV |
| C. | 26.9 MeV |
| D. | 13.9 MeV |
| Answer» C. 26.9 MeV | |
| 4406. |
If an electron and a positron annihiliate, then the energy released is [DCE 2001; AIIMS 2004] |
| A. | \[3.2\times {{10}^{-13}}J\] |
| B. | \[1.6\times {{10}^{-13}}J\] |
| C. | \[4.8\times {{10}^{-13}}J\] |
| D. | \[6.4\times {{10}^{-13}}J\] |
| Answer» C. \[4.8\times {{10}^{-13}}J\] | |
| 4407. |
In an atomic bomb, the energy is released due to [AIIMS 2001] |
| A. | Chain reaction of neutrons and \[_{92}{{U}^{235}}\] |
| B. | Chain reaction of neutrons and \[_{92}{{U}^{238}}\] |
| C. | Chain reaction of neutrons and \[_{92}{{P}^{240}}\] |
| D. | Chain reaction of neutrons and \[_{92}{{U}^{236}}\] |
| Answer» B. Chain reaction of neutrons and \[_{92}{{U}^{238}}\] | |
| 4408. |
In the nuclear reaction: \[X(n,\,\alpha ){{\,}_{3}}L{{i}^{7}}\] the term X will be 3 [CBSE PMT 2001; AIEEE 2005] |
| A. | \[_{5}{{B}^{10}}\] |
| B. | \[_{5}{{B}^{9}}\] |
| C. | \[_{5}{{B}^{11}}\] |
| D. | \[_{2}H{{e}^{4}}\] |
| Answer» B. \[_{5}{{B}^{9}}\] | |
| 4409. |
The average number of prompt neutrons produced per fission of \[{{U}^{235}}\]is [MP PMT 2000] |
| A. | More than 5 |
| B. | 3 to 5 |
| C. | 2 to 3 |
| D. | 1 to 2 |
| Answer» D. 1 to 2 | |
| 4410. |
To generate a power of 3.2 mega watt, the number of fissions of \[{{U}^{235}}\] per minute is (Energy released per fission = 200MeV, \[1eV=1.6\times {{10}^{-19}}J)\][EAMCET (Engg.) 2000] |
| A. | \[6\times {{10}^{18}}\] |
| B. | \[6\times {{10}^{17}}\] |
| C. | \[{{10}^{17}}\] |
| D. | \[6\times {{10}^{16}}\] |
| Answer» B. \[6\times {{10}^{17}}\] | |
| 4411. |
Atomic power station at Tarapore has a generating capacity of 200 MW. The energy generated in a day by this station is [NCERT 1975] |
| A. | 200 MW |
| B. | 200 J |
| C. | \[4800\times {{10}^{6}}\]J |
| D. | \[1728\times {{10}^{10}}\]J |
| Answer» E. | |
| 4412. |
Neutrino is a particle, which is [AIIMS 2000] |
| A. | Charged and has spin |
| B. | Charged and has no spin |
| C. | Charge less and has spin |
| D. | Charge less and has no spin |
| Answer» D. Charge less and has no spin | |
| 4413. |
If the energy released in the fission of one nucleus is 200 MeV. Then the number of nuclei required per second in a power plant of 16 kW will be [KCET (Engg.) 2000; CPMT 2001; Pb. PET 2002] |
| A. | \[0.5\times {{10}^{14}}\] |
| B. | \[0.5\times {{10}^{12}}\] |
| C. | \[5\times {{10}^{12}}\] |
| D. | \[5\times {{10}^{14}}\] |
| Answer» E. | |
| 4414. |
Boron rods in nuclear reactor are used as a [RPMT 2000] |
| A. | Moderator |
| B. | Control rods |
| C. | Coolants |
| D. | Protective shield |
| Answer» C. Coolants | |
| 4415. |
Which of the following particle has similar mass to electron [RPMT 2000] |
| A. | Proton |
| B. | Neutron |
| C. | Positron |
| D. | Neutrino |
| Answer» D. Neutrino | |
| 4416. |
Which of the following is true for a sample of isotope containing \[{{U}^{235}}\] and \[{{U}^{238}}\] [RPET 2000] |
| A. | Number of neutron are same in both |
| B. | Number of proton, electron and neutron are same in both |
| C. | Contain same number of protons and electrons but U238 contains 3 more neutrons than U235 |
| D. | U238 contains 3 less neutron then U235 |
| Answer» D. U238 contains 3 less neutron then U235 | |
| 4417. |
Nuclear fission was discovered by [RPET 2000] |
| A. | Auto Hahn and F. strassmann |
| B. | Fermi |
| C. | Bethe |
| D. | Rutherford |
| Answer» B. Fermi | |
| 4418. |
Best neutron moderator is [RPET 2000] |
| A. | Berillium oxide |
| B. | Pure water |
| C. | Heavy water |
| D. | Graphite |
| Answer» B. Pure water | |
| 4419. |
Energy released in fusion of 1 kg of deuterium nuclei [RPET 2000] |
| A. | \[8\times {{10}^{13}}\,J\] |
| B. | \[6\times {{10}^{27}}\,J\] |
| C. | \[2\times {{10}^{7}}\,KwH\] |
| D. | \[8\times {{10}^{23}}\,MeV\] |
| Answer» E. | |
| 4420. |
The number of neutrons released when \[_{92}{{U}^{235}}\] undergoes fission by absorbing \[_{0}{{n}^{1}}\] and \[{{(}_{56}}B{{a}^{144}}{{+}_{36}}K{{r}^{89}})\] are formed, is [Pb. PMT 2000] |
| A. | 0 |
| B. | 1 |
| C. | 2 |
| D. | 3 |
| Answer» E. | |
| 4421. |
Hydrogen bomb is based on which of the following phenomenon [CPMT 2000] |
| A. | Nuclear fission |
| B. | Nuclear fusion |
| C. | Radioactive decay |
| D. | None of these |
| Answer» C. Radioactive decay | |
| 4422. |
The mass defect for the nucleus of helium is 0.0303 a.m.u. What is the binding energy per nucleon for helium in MeV [NCERT 1990] |
| A. | 28 |
| B. | 7 |
| C. | 4 |
| D. | 1 |
| Answer» C. 4 | |
| 4423. |
In a nuclear fission reaction [AMU (Med.) 2000] |
| A. | Two light nuclei combine to produce a heavier nucleus |
| B. | A light nucleus bombarded by thermal neutrons breaks up |
| C. | A heavy nucleus bombarded by thermal neutrons breaks up |
| D. | A heavy nucleus breaks up by itself |
| Answer» D. A heavy nucleus breaks up by itself | |
| 4424. |
Which of these is a fusion reaction [DCE 1999] |
| A. | \[_{3}^{1}H+_{2}^{1}H=_{4}^{2}He+_{1}^{0}n\] |
| B. | \[_{92}^{238}U\,\to \,_{82}^{206}Pb+8\,(_{2}^{4}He)+6\,(_{-1}^{0}\beta )\] |
| C. | \[_{7}^{12}C\,\to \,_{6}^{12}C+{{\beta}^{+}}+\gamma \] |
| D. | None of these |
| Answer» B. \[_{92}^{238}U\,\to \,_{82}^{206}Pb+8\,(_{2}^{4}He)+6\,(_{-1}^{0}\beta )\] | |
| 4425. |
If a proton and anti-proton come close to each other and annihilate, how much energy will be released [DCE 1999; 2003] |
| A. | \[1.5\times {{10}^{-10}}J\] |
| B. | \[3\times {{10}^{-10}}J\] |
| C. | \[4.5\times {{10}^{-10}}J\] |
| D. | None of these |
| Answer» C. \[4.5\times {{10}^{-10}}J\] | |
| 4426. |
When a slow neutron goes sufficiently close to a \[{{U}^{235}}\]nucleus, then the process that takes place is [AFMC 1998] |
| A. | Fission of \[{{U}^{235}}\] |
| B. | Fusion of neutron |
| C. | Fusion of \[{{U}^{235}}\] |
| D. | First (a) then (b) |
| Answer» B. Fusion of neutron | |
| 4427. |
Energy in the sun is generated mainly by [JIPMER 1997; AIIMS 1999; BHU 2000] |
| A. | Fusion of radioactive material |
| B. | Fission of helium atoms |
| C. | Chemical reaction |
| D. | Fusion of hydrogen atoms |
| Answer» E. | |
| 4428. |
Which of the following is used as a moderator in nuclear reactors [CBSE PMT 1997; AIIMS 1999; AFMC 2001] |
| A. | Uranium |
| B. | Heavy water |
| C. | Cadmium |
| D. | Plutonium |
| Answer» C. Cadmium | |
| 4429. |
A free neutron decays into a proton, an electron and [CBSE PMT 1997; DPMT 2001] |
| A. | A neutrino |
| B. | An antineutrino |
| C. | An alpha particle |
| D. | A beta particle |
| Answer» C. An alpha particle | |
| 4430. |
Nuclear fission experiments show that the neutrons split the uranium nuclei into two fragments of about same size. This process is accompanied by the emission of several [CBSE PMT 1994; SCRA 1994; DPMT 2000] |
| A. | Protons and positrons |
| B. | a-particles |
| C. | Neutrons |
| D. | Protons and a-particles |
| Answer» D. Protons and a-particles | |
| 4431. |
Heavy water is used as moderator in a nuclear reactor. The function of the moderator is [CBSE PMT 1994; EAMCET (Engg.) 1995; AFMC 2002; DPMT 2003; DCE 2004] |
| A. | To control the energy released in the reactor |
| B. | To absorb neutrons and stop chain reaction |
| C. | To cool the reactor faster |
| D. | To slow down the neutrons to thermal energies |
| Answer» E. | |
| 4432. |
The masses of neutron and proton are 1.0087 a.m.u. and 1.0073 a.m.u. respectively. If the neutrons and protons combine to form a helium nucleus (alpha particles) of mass 4.0015 a.m.u. The binding energy of the helium nucleus will be (1 a.m.u.= 931MeV) [CPMT 1986; MP PMT 1995; CBSE PMT 2003] |
| A. | 28.4 MeV |
| B. | 20.8 MeV |
| C. | 27.3 MeV |
| D. | 14.2 MeV |
| Answer» B. 20.8 MeV | |
| 4433. |
Which one of the following nuclear reactions is a source of energy in the sun [BHU 1994] |
| A. | \[_{4}^{9}Be+_{2}^{4}He\to _{6}^{12}C+_{0}^{-1}n\] |
| B. | \[_{2}^{3}He+_{2}^{3}He\to _{2}^{4}He+_{1}^{1}H+_{1}^{1}H\] |
| C. | \[_{56}^{144}Ba+_{56}^{92}Kr\to _{92}^{235}U+_{0}^{-1}n\] |
| D. | \[_{26}^{56}Fe+_{48}^{112}Ca\to _{74}^{167}W+_{0}^{-1}n\] |
| Answer» C. \[_{56}^{144}Ba+_{56}^{92}Kr\to _{92}^{235}U+_{0}^{-1}n\] | |
| 4434. |
The energy released in a typical nuclear fusion reaction is approximately [IIT 1992] |
| A. | 25 MeV |
| B. | 200 MeV |
| C. | 800 MeV |
| D. | 1050 MeV |
| Answer» B. 200 MeV | |
| 4435. |
Energy released in the fission of a single \[_{92}{{U}^{235}}\] nucleus is 200 MeV. The fission rate of a \[_{92}{{U}^{235}}\]fuelled reactor operating at a power level of 5W is [CBSE PMT 1993] |
| A. | \[1.56\times {{10}^{+10}}{{s}^{-1}}\] |
| B. | \[1.56\times {{10}^{+11}}{{s}^{-1}}\] |
| C. | \[1.56\times {{10}^{+16}}{{s}^{-1}}\] |
| D. | \[1.56\times {{10}^{+17}}{{s}^{-1}}\] |
| Answer» C. \[1.56\times {{10}^{+16}}{{s}^{-1}}\] | |
| 4436. |
When neutrons are bombarded on nucleus of \[_{92}{{U}^{235}}\], the number of emitted neutrons will be [RPMT 1997] |
| A. | 1 |
| B. | 2 |
| C. | 3 |
| D. | 4 |
| Answer» D. 4 | |
| 4437. |
In the nuclear reaction \[_{6}{{C}^{11}}{{\to }_{5}}{{B}^{11}}+{{\beta }^{+}}+X\], what does X stand for [MNR 1998] |
| A. | An electron |
| B. | A proton |
| C. | A neutron |
| D. | A neutrino |
| Answer» E. | |
| 4438. |
In the following reaction \[_{12}M{{g}^{24}}{{+}_{2}}H{{e}^{4}}{{\to }_{14}}S{{i}^{X}}{{+}_{0}}{{n}^{1}},X\]is [SCRA 1994] |
| A. | 28 |
| B. | 27 |
| C. | 26 |
| D. | 22 |
| Answer» C. 26 | |
| 4439. |
Thermal neutrons can cause fission in [SCRA 1994] |
| A. | \[{{U}^{235}}\] |
| B. | \[{{U}^{238}}\] |
| C. | \[P{{u}^{238}}\] |
| D. | \[T{{h}^{232}}\] |
| Answer» B. \[{{U}^{238}}\] | |
| 4440. |
In the nuclear reaction \[_{85}{{X}^{297}}\to Y+4\alpha ,\ Y\]is [Bihar MEE 1995] |
| A. | \[_{76}{{Y}^{287}}\] |
| B. | \[_{77}{{Y}^{285}}\] |
| C. | \[_{77}{{Y}^{281}}\] |
| D. | \[_{77}{{Y}^{289}}\] |
| Answer» D. \[_{77}{{Y}^{289}}\] | |
| 4441. |
1 g of hydrogen is converted into 0.993 g of helium in a thermonuclear reaction. The energy released is [EAMCET (Med.) 1995; CPMT 1999] |
| A. | \[63\times {{10}^{7}}J\] |
| B. | \[63\times {{10}^{10}}J\] |
| C. | \[63\times {{10}^{14}}J\] |
| D. | \[63\times {{10}^{20}}J\] |
| Answer» C. \[63\times {{10}^{14}}J\] | |
| 4442. |
A body starting from rest moves with constant acceleration. The ratio of distance covered by the body during the 5th sec to that covered in 5 sec is [Kerala PET 2005] |
| A. | 9/25 |
| B. | 3/5 |
| C. | 25/9 |
| D. | 1/25 |
| Answer» B. 3/5 | |
| 4443. |
What determines the nature of the path followed by the particle [AFMC 2005] |
| A. | Speed |
| B. | Velocity |
| C. | Acceleration |
| D. | None of these |
| Answer» E. | |
| 4444. |
A particle moves along x-axis as \[x=4(t-2)+a{{(t-2)}^{2}}\] Which of the following is true? [J&K CET 2005] |
| A. | The initial velocity of particle is 4 |
| B. | The acceleration of particle is 2a |
| C. | The particle is at origin at t = 0 |
| D. | None of these |
| Answer» C. The particle is at origin at t = 0 | |
| 4445. |
A man is 45 m behind the bus when the bus start accelerating from rest with acceleration 2.5 m/s2. With what minimum velocity should the man start running to catch the bus? [J&K CET 2005] |
| A. | 12 m/s |
| B. | 14 m/s |
| C. | 15 m/s |
| D. | 16 m/s |
| Answer» D. 16 m/s | |
| 4446. |
The displacement \[x\] of a particle varies with time \[t,x=a{{e}^{-\alpha t}}+b{{e}^{\beta t}}\], where \[a,\,b,\,\alpha \,\text{and }\beta \]are positive constants. The velocity of the particle will [CBSE PMT 2005] |
| A. | Go on decreasing with time |
| B. | Be independent of \[\alpha \] and \[\beta \] |
| C. | Drop to zero when \[\alpha =\beta \] |
| D. | Go on increasing with time |
| Answer» E. | |
| 4447. |
A body under the action of several forces will have zero acceleration |
| A. | When the body is very light |
| B. | When the body is very heavy |
| C. | When the body is a point body |
| D. | When the vector sum of all the forces acting on it is zero |
| Answer» E. | |
| 4448. |
A car, starting from rest, accelerates at the rate f through a distance S, then continues at constant speed for time t and then decelerates at the rate \[\frac{f}{2}\] to come to rest. If the total distance traversed is 15 S, then [AIEEE 2005] |
| A. | \[S=\frac{1}{2}f{{t}^{2}}\] |
| B. | \[S=\frac{1}{4}f{{t}^{2}}\] |
| C. | \[S=\frac{1}{72}f{{t}^{2}}\] |
| D. | \[S=\frac{1}{6}f{{t}^{2}}\] |
| Answer» D. \[S=\frac{1}{6}f{{t}^{2}}\] | |
| 4449. |
Speed of two identical cars are \[u\] and \[4u\] at a specific instant. The ratio of the respective distances in which the two cars are stopped from that instant is [AIEEE 2002] |
| A. | 1 : 1 |
| B. | 1 : 4 |
| C. | 1 : 8 |
| D. | 1 : 16 |
| Answer» E. | |
| 4450. |
A body is moving with uniform acceleration describes 40 m in the first 5 sec and 65 m in next 5 sec. Its initial velocity will be [Pb. PET 2003] |
| A. | 4 m/s |
| B. | 2.5 m/s |
| C. | 5.5 m/s |
| D. | 11 m/s |
| Answer» D. 11 m/s | |