

McqMate
These multiple-choice questions (MCQs) are designed to enhance your knowledge and understanding in the following areas: Uncategorized topics .
Chapters
451. |
At higher energy, the bodies have |
A. | small mass |
B. | large mass |
C. | zero mass |
D. | smaller weight |
Answer» B. large mass |
452. |
Time taken by a radioactive substance to decay half is called |
A. | time delay |
B. | half life |
C. | time constant |
D. | half period |
Answer» B. half life |
453. |
Most stable isotope in nature is of |
A. | iron-56 |
B. | carbon-12 |
C. | uranium-235 |
D. | uranium-238 |
Answer» A. iron-56 |
454. |
Activity of one decay per second is equal to |
A. | 1 Bq |
B. | 1 atm |
C. | 1 mol |
D. | 1 Cd |
Answer» A. 1 Bq |
455. |
The greater the decay constant |
A. | the less the activity |
B. | the greater the activity |
C. | the greater the size |
D. | the less the size |
Answer» B. the greater the activity |
456. |
Total amount of mass and energy together in a system is |
A. | increasing |
B. | decreasing |
C. | zero |
D. | constant |
Answer» D. constant |
457. |
Process by which energy is released in sun is |
A. | fission |
B. | Haber's process |
C. | fusion |
D. | radioactivity |
Answer» C. fusion |
458. |
Minimum energy required to pull nucleus apart is called |
A. | ionization energy |
B. | electron affinity |
C. | chemical energy |
D. | binding energy |
Answer» D. binding energy |
459. |
Mass excess for U-235 is |
A. | 0.034 u |
B. | 0.043 u |
C. | 0.05 u |
D. | 0.06 u |
Answer» B. 0.043 u |
460. |
As compared to proton, mass of neutron is |
A. | 10% greater |
B. | 5% greater |
C. | 1% greater |
D. | 0.1% greater |
Answer» D. 0.1% greater |
461. |
1 mole of uranium-238 has potential to emit total energy equal to about |
A. | 109 J |
B. | 1010 J |
C. | 1011 J |
D. | 1012 J |
Answer» C. 1011 J |
462. |
If energy is released from a system, it's mass |
A. | decreases |
B. | increases |
C. | constant |
D. | zero |
Answer» A. decreases |
463. |
New nucleus after alpha particle decays, is called |
A. | parent nucleus |
B. | daughter nucleus |
C. | decayed nucleus |
D. | undecayed nucleus |
Answer» B. daughter nucleus |
464. |
If nucleus is formed from separate nucleons, then energy is |
A. | gained |
B. | released |
C. | converted |
D. | absorbed |
Answer» B. released |
465. |
Maximum displacement from equilibrium position is |
A. | frequency |
B. | amplitude |
C. | wavelength |
D. | period |
Answer» B. amplitude |
466. |
Displacement-time graph depicting an oscillatory motion is |
A. | cos curve |
B. | sine curve |
C. | tangent curve |
D. | straight line |
Answer» B. sine curve |
467. |
In s.h.m, velocity at equilibrium position is |
A. | minimum |
B. | constant |
C. | maximum |
D. | zero |
Answer» C. maximum |
468. |
Natural frequency of a guitar string can be changed by changing it's |
A. | area |
B. | diameter |
C. | length |
D. | stiffness |
Answer» C. length |
469. |
Over-damping results in |
A. | slower return to equilibrium |
B. | faster return to equilibrium |
C. | equilibrium is never achieved |
D. | arrhythmic return to equilibrium |
Answer» A. slower return to equilibrium |
470. |
Our eyes detect the oscillations up to |
A. | 8 Hz |
B. | 9 Hz |
C. | 6 Hz |
D. | 5 Hz |
Answer» D. 5 Hz |
471. |
For s.h.m, maximum speed is proportional to |
A. | wavelength |
B. | acceleration |
C. | time |
D. | frequency |
Answer» D. frequency |
472. |
A force that acts to return the mass to it's equilibrium position is called |
A. | frictional force |
B. | restoring force |
C. | normal force |
D. | contact force |
Answer» B. restoring force |
473. |
In cars, springs are damped by |
A. | shock absorbers |
B. | engine |
C. | tyres |
D. | brake pedals |
Answer» A. shock absorbers |
474. |
If time period of an oscillation is 0.40 s, then it's frequency is |
A. | 2 Hz |
B. | 2.5 Hz |
C. | 3 Hz |
D. | 3.5 Hz |
Answer» B. 2.5 Hz |
475. |
As amplitude of resonant vibrations decreases, degree of damping |
A. | increases |
B. | remains same |
C. | decreases |
D. | varies |
Answer» C. decreases |
476. |
Oscillations become damped due to |
A. | normal force |
B. | friction |
C. | tangential force |
D. | parallel force |
Answer» B. friction |
477. |
In s.h.m, object's acceleration depends upon |
A. | displacement from equilibrium position |
B. | magnitude of restoring force |
C. | both A and B |
D. | force exerted on it |
Answer» C. both A and B |
478. |
angular frequency of s.h.m is equal to |
A. | 2π |
B. | 2πf |
C. | 2f |
D. | 1⁄T |
Answer» B. 2πf |
479. |
For a resonating system it should oscillate |
A. | bound |
B. | only for some time |
C. | freely |
D. | for infinite time |
Answer» C. freely |
480. |
Velocity at equilibrium position is |
A. | constant |
B. | minimum |
C. | maximum |
D. | zero |
Answer» C. maximum |
481. |
If the swing moves from right to left, then velocity is |
A. | negative |
B. | positive |
C. | constant |
D. | zero |
Answer» A. negative |
482. |
Acceleration is directly related to |
A. | displacement |
B. | negative of displacement |
C. | velocity |
D. | negative of speed |
Answer» B. negative of displacement |
483. |
Gradient of velocity-time graph gives |
A. | force |
B. | frequency |
C. | wavelength |
D. | acceleration |
Answer» D. acceleration |
484. |
Magnitude of gradient of a-x graph is {{}} |
A. | ω |
B. | ω2 |
C. | ω⁄2 |
D. | ω3 |
Answer» B. ω2 |
485. |
Potential energy of system is maximum at |
A. | extreme position |
B. | mean position |
C. | in between extreme and mean position |
D. | moderate position |
Answer» A. extreme position |
486. |
In s.h.m, acceleration is always directed towards the |
A. | equilibrium position |
B. | mean position |
C. | tangent to the motion |
D. | downwards |
Answer» A. equilibrium position |
487. |
Number of oscillations per unit time is |
A. | amplitude |
B. | wavelength |
C. | frequency |
D. | period |
Answer» C. frequency |
488. |
When displacement x = 0, then kinetic energy of system is |
A. | minimum |
B. | maximum |
C. | constant |
D. | zero |
Answer» B. maximum |
489. |
Energy of a system executing s.h.m is |
A. | increasing |
B. | decreasing |
C. | constant |
D. | variable |
Answer» C. constant |
490. |
Oscillatory motion has a |
A. | straight lined graph |
B. | randomly lined graph |
C. | sinusoidal graph |
D. | asymptotic graph |
Answer» C. sinusoidal graph |
491. |
During one oscillation, phase of oscillation changes by |
A. | π rad |
B. | π⁄2 rad |
C. | 2π rad |
D. | 4π rad |
Answer» C. 2π rad |
492. |
If an object moves back and forth repeatedly around a mean position it is called |
A. | oscillating |
B. | revolving |
C. | rotating |
D. | motion |
Answer» A. oscillating |
493. |
Terminal potential difference of battery depends on |
A. | current |
B. | temperature |
C. | both A and B |
D. | resistance of external resistor |
Answer» D. resistance of external resistor |
494. |
Systematic errors occur due to |
A. | overuse of instruments |
B. | careless usage of instruments |
C. | both A and B |
D. | human sight |
Answer» C. both A and B |
495. |
In cells, internal resistance is due to |
A. | components inside |
B. | chemicals within |
C. | lead blocks |
D. | graphite |
Answer» B. chemicals within |
496. |
Measurement which is close to the true value is |
A. | accurate |
B. | average |
C. | precise |
D. | error |
Answer» A. accurate |
497. |
A train with a whistle that emits a note of frequency 800 Hz is approaching an observer at speed of 60 m s-1, the frequency of note heard by observer is {{}} |
A. | 978 Hz |
B. | 980 Hz |
C. | 950 Hz |
D. | 900 Hz |
Answer» A. 978 Hz |
498. |
Smallest division on a rule is of |
A. | 1 cm |
B. | 1 m |
C. | 1 mm |
D. | 10 cm |
Answer» C. 1 mm |
499. |
If the two quantizes are inversely proportional then graph between y and 1/x gives |
A. | straight line cutting the axis |
B. | straight line through origin |
C. | a parabolic curve |
D. | a hyperbolic curve |
Answer» B. straight line through origin |
500. |
Systematic errors can be removed by |
A. | buying new instrument |
B. | breaking the instrument |
C. | dusting the instrument |
D. | recalibrating the instrument |
Answer» D. recalibrating the instrument |
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