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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.
| 6701. |
When a certain circuit consisting of a constant e.m.f. E an inductance L and a resistance R is closed, the current in, it increases with time according to curve 1. After one parameter (E, L or R) is changed, the increase in current follows curve 2 when the circuit is closed second time. Which parameter was changed and in what direction |
| A. | L is increased |
| B. | L is decreased |
| C. | R is increased |
| D. | R is decreased |
| Answer» B. L is decreased | |
| 6702. |
The variation of the intensity of magnetisation (I) with respect to the magnetising field (H) in a diamagnetic substance is described by the graph [KCET 2002] |
| A. | OD |
| B. | OC |
| C. | OB |
| D. | OA |
| Answer» C. OB | |
| 6703. |
Two tuning forks P and Q are vibrated together. The number of beats produced are represented by the straight line OA in the following graph. After loading Q with wax again these are vibrated together and the beats produced are represented by the line OB. If the frequency of P is 341Hz, the frequency of Q will be |
| A. | 341 Hz |
| B. | 338 Hz |
| C. | 344 Hz |
| D. | None of the above |
| Answer» D. None of the above | |
| 6704. |
The variation of the acceleration a of the particle executing S.H.M. with displacement y is as shown in the figure |
| A. | |
| B. | |
| C. | |
| D. | |
| Answer» D. | |
| 6705. |
Heat is flowing through a conductor of length l from x = 0 to x = l. If its thermal resistance per unit length is uniform, which of the following graphs is correct |
| A. | |
| B. | |
| C. | |
| D. | |
| Answer» D. | |
| 6706. |
An ideal gas is taken through the cycle A ® B ® C ® A, as shown in the figure. If the net heat supplied to the gas in the cycle is 5 J, the work done by the gas in the process C ® A is [IIT-JEE (Screening) 2002; RPMT 2004] |
| A. | ? 5 J |
| B. | ? 10 J |
| C. | ? 15 J |
| D. | ? 20 J |
| Answer» B. ? 10 J | |
| 6707. |
The graph signifies [JIPMER 1999] |
| A. | Adiabatic expansion of a gas |
| B. | Isothermal expansion of a gas |
| C. | Change of state from liquid to solid |
| D. | Cooling of a heated solid |
| Answer» D. Cooling of a heated solid | |
| 6708. |
The graph shows the behaviour of a length of wire in the region for which the substance obeys Hook?s law. P and Q represent [AMU 2001] |
| A. | P = applied force, Q = extension |
| B. | P = extension, Q = applied force |
| C. | P = extension, Q = stored elastic energy |
| D. | P = stored elastic energy, Q = extension |
| Answer» D. P = stored elastic energy, Q = extension | |
| 6709. |
Equipotential surfaces are shown in figure. Then the electric field strength will be |
| A. | \[\text{1}00V{{m}^{\text{1}}}\] along X-axis |
| B. | \[\text{1}00V{{m}^{\text{1}}}\] along Y-axis |
| C. | \[200V{{m}^{\text{1}}}\] at an angle \[\text{12}{{0}^{\text{o}}}\] with X-axis |
| D. | \[50V{{m}^{\text{1}}}\]at an angle \[\text{12}{{0}^{\text{o}}}\] with X-axis |
| Answer» D. \[50V{{m}^{\text{1}}}\]at an angle \[\text{12}{{0}^{\text{o}}}\] with X-axis | |
| 6710. |
Figures I, II, III and IV depict variation of force with time (I) (II) (III) (IV) The impulse is highest in the case of situations depicted. Figure |
| A. | I and II |
| B. | III and I |
| C. | III and IV |
| D. | IV only |
| Answer» D. IV only | |
| 6711. |
Figures (i) and (ii) below show the displacement-time graphs of two particles moving along the x-axis. We can say that [Kurukshetra CEE 1996] |
| A. | Both the particles are having a uniformly accelerated motion |
| B. | Both the particles are having a uniformly retarded motion |
| C. | Particle (i) is having a uniformly accelerated motion while particle (ii) is having a uniformly retarded motion |
| D. | Particle (i) is having a uniformly retarded motion while particle (ii) is having a uniformly accelerated motion |
| Answer» D. Particle (i) is having a uniformly retarded motion while particle (ii) is having a uniformly accelerated motion | |
| 6712. |
The given figure shows the wave forms for two inputs A and B and that for the output Y of a logic circuit. The logic circuit is [UPSEAT 2002] (Y) |
| A. | An AND gate |
| B. | An OR gate |
| C. | A NAND gate |
| D. | An NOT gate |
| Answer» B. An OR gate | |
| 6713. |
If in hydrogen atom, radius of \[{{n}^{th}}\] Bohr orbit is \[{{r}_{n}},\] frequency of revolution of electron in \[{{n}^{th}}\] orbit is \[{{f}_{n}}\] choose the correct option |
| A. | |
| B. | |
| C. | |
| D. | Both (a) and (b) |
| Answer» E. | |
| 6714. |
Two sinusoidal voltages of the same frequency are shown in the diagram. What is the frequency, and the phase relationship between the voltages Frequency in Hz Phase lead of N over M in radians |
| A. | 0.4 \[-\pi /4\] |
| B. | 2.5 \[-\pi /2\] |
| C. | 2.5 \[+\pi /2\] |
| D. | 2.5 \[-\pi /4\] |
| Answer» C. 2.5 \[+\pi /2\] | |
| 6715. |
The figure illustrate how B, the flux density inside a sample of unmagnetised ferromagnetic material varies with B0, the magnetic flux density in which the sample is kept. For the sample to be suitable for making a permanent magnet [AMU 2001] |
| A. | OQ should be large, OR should be small |
| B. | OQ and OR should both be large |
| C. | OQ should be small and OR should be large |
| D. | OQ and OR should both be small |
| Answer» C. OQ should be small and OR should be large | |
| 6716. |
Two pulses travel in mutually opposite directions in a string with a speed of 2.5 cm/s as shown in the figure. Initially the pulses are 10cm apart. What will be the state of the string after two seconds |
| A. | |
| B. | |
| C. | |
| D. | |
| Answer» D. | |
| 6717. |
Graph between velocity and displacement of a particle, executing S.H.M. is [DPMT 2005] |
| A. | A straight line |
| B. | A parabola |
| C. | A hyperbola |
| D. | An ellipse |
| Answer» E. | |
| 6718. |
For a small temperature difference between the body and the surroundings the relation between the rate of loss heat R and the temperature of the body is depicted by |
| A. | |
| B. | |
| C. | |
| D. | |
| Answer» D. | |
| 6719. |
The P-V diagram of a system undergoing thermodynamic transformation is shown in figure. The work done on the system in going from A ® B ® C is 50 J and 20 cal heat is given to the system. The change in internal energy between A and C is [UPSEAT 2002] |
| A. | 34 J |
| B. | 70 J |
| C. | 84 J |
| D. | 134 J |
| Answer» E. | |
| 6720. |
A student takes 50gm wax (specific heat = 0.6 kcal/kg°C) and heats it till it boils. The graph between temperature and time is as follows. Heat supplied to the wax per minute and boiling point are respectively [BHU 1994] |
| A. | 500 cal, 50°C |
| B. | 1000 cal, 100°C |
| C. | 1500 cal, 200°C |
| D. | 200°C |
| Answer» D. 200°C | |
| 6721. |
For a cell, the graph between the potential difference (V) across the terminals of the cell and the current (I) drawn from the cell is shown in the figure. The e.m.f. and the internal resistance of the cell are |
| A. | \[2V,0.5\Omega \] |
| B. | \[2V,0.4\Omega \] |
| C. | \[>2V,0.5\Omega \] |
| D. | \[>2V,0.4\Omega \] |
| Answer» C. \[>2V,0.5\Omega \] | |
| 6722. |
Change Q on a capacitor varies with voltage V as shown in the figure, where Q is taken along the X-axis and V along the Y-axis. The area of triangle OAB represents [Kerala (Engg.) 2001] |
| A. | Capacitance |
| B. | Capacitive reactance |
| C. | Magnetic field between the plates |
| D. | Energy stored in the capacitor |
| Answer» E. | |
| 6723. |
The graph is drawn between the applied force F and the strain (x) for a thin uniform wire. The wire behaves as a liquid in the part [CPMT 1988] |
| A. | ab |
| B. | bc |
| C. | cd |
| D. | oa |
| Answer» C. cd | |
| 6724. |
The relation between the displacement X of an object produced by the application of the variable force F is represented by a graph shown in the figure. If the object undergoes a displacement from \[X=0.5\,m\] to \[X=2.5\,m\] the work done will be approximately equal to [CPMT 1986] |
| A. | 16 J |
| B. | 32 J |
| C. | 1.6 J |
| D. | 8 J |
| Answer» B. 32 J | |
| 6725. |
The variation of momentum with time of one of the body in a two body collision is shown in fig. The instantaneous force is maximum corresponding to point |
| A. | P |
| B. | Q |
| C. | R |
| D. | S |
| Answer» D. S | |
| 6726. |
Velocity-time (v-t) graph for a moving object is shown in the figure. Total displacement of the object during the time interval when there is non-zero acceleration and retardation is [Kerala PMT 2005] |
| A. | 60 m |
| B. | 50 m |
| C. | 30 m |
| D. | 40 m |
| Answer» C. 30 m | |
| 6727. |
The i-V characteristic of a P-N junction diode is shown below. The approximate dynamic resistance of the P-N junction when a forward bias of 2volt is applied |
| A. | 1 W |
| B. | 0.25 W |
| C. | 0.5 W |
| D. | 5 W |
| Answer» C. 0.5 W | |
| 6728. |
A source voltage of 8V drives the diode in fig. through a current-limiting resistor of 100 ohm. Then the magnitude of the slope load line on the V-I characteristics of the diode is |
| A. | 0.01 |
| B. | 100 |
| C. | 0.08 |
| D. | 12.5 |
| Answer» B. 100 | |
| 6729. |
A full wave rectifier circuit along with the input and output voltages is shown in the figure The contribution to output voltage from diode ? 2 is [MP PMT 2001] |
| A. | A, C |
| B. | B, D |
| C. | B, C |
| D. | A, D |
| Answer» C. B, C | |
| 6730. |
The figure represents the observed intensity of X-rays emitted by an X-ray tube as a function of wavelength. The sharp peaks A and B denote [CBSE PMT 1995] |
| A. | Band spectrum |
| B. | Continuous spectrum |
| C. | Characteristic radiations |
| D. | White radiations |
| Answer» D. White radiations | |
| 6731. |
When an ac source of e.m.f. \[e={{E}_{0}}\]\[\sin (100\,t)\] is connected across a circuit, the phase difference between the e.m.f. e and the current i in the circuit is observed to be \[\pi /4\], as shown in the diagram. If the circuit consists possibly only of RC or LC in series, find the relationship between the two elements [IIT-JEE (Screening) 2003] |
| A. | \[R=1k\Omega ,\,C=10\mu F\] |
| B. | \[R=1k\Omega ,\,C=1\mu F\] |
| C. | \[R=1k\Omega ,\,L=10H\] |
| D. | \[R=1k\Omega ,\,L=1H\] |
| Answer» B. \[R=1k\Omega ,\,C=1\mu F\] | |
| 6732. |
The current i in an inductance coil varies with time, t according to the graph shown in fig. Which one of the following plots shows the variation of voltage in the coil with time [CBSE PMT 1994] |
| A. | |
| B. | |
| C. | |
| D. | |
| Answer» D. | |
| 6733. |
The \[\chi -1/T\]graph for an alloy of paramagnetic nature is shown in Fig. The curie constant is, then |
| A. | 57 K |
| B. | \[2.8\times {{10}^{-3}}K\] |
| C. | 570 K |
| D. | \[17.5\times {{10}^{-3}}K\] |
| Answer» B. \[2.8\times {{10}^{-3}}K\] | |
| 6734. |
If the speed of the wave shown in the figure is 330m/s in the given medium, then the equation of the wave propagating in the positive x-direction will be (all quantities are in M.K.S. units) |
| A. | \[y=0.05\sin 2\pi (4000\,t-12.5\,x)\] |
| B. | \[y=0.05\sin 2\pi (4000\,t-122.5\,x)\] |
| C. | \[y=0.05\sin 2\pi (3300\,t-10\,x)\] |
| D. | \[y=0.05\sin 2\pi (3300\,x-10\,t)\] |
| Answer» D. \[y=0.05\sin 2\pi (3300\,x-10\,t)\] | |
| 6735. |
The correct graph between the frequency n and square root of density (r) of a wire, keeping its length, radius and tension constant, is |
| A. | |
| B. | |
| C. | |
| D. | |
| Answer» D. | |
| 6736. |
In case of a simple pendulum, time period versus length is depicted by [DCE 1999, 2001] |
| A. | |
| B. | |
| C. | |
| D. | |
| Answer» C. | |
| 6737. |
For a simple pendulum the graph between L and T will be. [CPMT 1992] |
| A. | Hyperbola |
| B. | Parabola |
| C. | A curved line |
| D. | A straight line |
| Answer» C. A curved line | |
| 6738. |
A body of mass 0.01 kg executes simple harmonic motion (S.H.M.) about \[x=0\] under the influence of a force shown below : The period of the S.H.M. is [AMU (Med.) 2002] |
| A. | 1.05 s |
| B. | 0.52 s |
| C. | 0.25 s |
| D. | 0.30 s |
| Answer» E. | |
| 6739. |
The energy distribution \[E\] with the wavelength \[(\lambda )\] for the black body radiation at temperature \[T\ Kelvin\]is shown in the figure. As the temperature is increased the maxima will |
| A. | Shift towards left and become higher |
| B. | Rise high but will not shift |
| C. | Shift towards right and become higher |
| D. | Shift towards left and the curve will become broader |
| Answer» B. Rise high but will not shift | |
| 6740. |
Heat is supplied to a certain homogenous sample of matter, at a uniform rate. Its temperature is plotted against time, as shown. Which of the following conclusions can be drawn |
| A. | Its specific heat capacity is greater in the solid state than in the liquid state |
| B. | Its specific heat capacity is greater in the liquid state than in the solid state |
| C. | Its latent heat of vaporization is greater than its latent heat of fusion |
| D. | Its latent heat of vaporization is smaller than its latent of fusion |
| Answer» D. Its latent heat of vaporization is smaller than its latent of fusion | |
| 6741. |
Resistance as shown in figure is negative at [CPMT 1997] |
| A. | A |
| B. | B |
| C. | C |
| D. | None of these |
| Answer» B. B | |
| 6742. |
The variation of velocity of a particle with time moving along a straight line is illustrated in the following figure. The distance travelled by the particle in four seconds is [NCERT 1973] |
| A. | 60 \[m\] |
| B. | 55 \[m\] |
| C. | 25 \[m\] |
| D. | 30 \[m\] |
| Answer» C. 25 \[m\] | |
| 6743. |
In an experiment of find the focal length of a concave mirror a graph is drawn between the magnitudes of u and v. The graph looks like [AIIMS 2003] |
| A. | |
| B. | |
| C. | |
| D. | |
| Answer» D. | |
| 6744. |
In a forward biased PN-junction diode, the potential barrier in the depletion region is of the form ? [KCET 2004] |
| A. | |
| B. | |
| C. | |
| D. | |
| Answer» C. | |
| 6745. |
The curve drawn between velocity and frequency of photon in vacuum will be a [MP PET 2000] |
| A. | Straight line parallel to frequency axis |
| B. | Straight line parallel to velocity axis |
| C. | Straight line passing through origin and making an angle of 45o with frequency axis |
| D. | Hyperbola |
| Answer» B. Straight line parallel to velocity axis | |
| 6746. |
Which one of the following curves represents the variation of impedance (Z) with frequency f in series LCR circuit |
| A. | |
| B. | |
| C. | |
| D. | |
| Answer» D. | |
| 6747. |
The graph shows the variation in magnetic flux \[\varphi (t)\] with time through a coil. Which of the statements given below is not correct [AMU (Engg.) 2001] |
| A. | There is a change in the direction as well as magnitude of the induced emf between B and D |
| B. | The magnitude of the induced emf is maximum between B and C |
| C. | There is a change in the direction as well as magnitude of induced emf between A and C |
| D. | The induced emf is zero at B |
| Answer» E. | |
| 6748. |
Two pulses in a stretched string whose centres are initially 8 cm apart are moving towards each other as shown in the figure. The speed of each pulse is 2 cm/s. After 2 seconds, the total energy of the pulses will be [IIT-JEE (Screening) 2001] |
| A. | Zero |
| B. | Purely kinetic |
| C. | Purely potential |
| D. | Partly kinetic and partly potential |
| Answer» C. Purely potential | |
| 6749. |
The rope shown at an instant is carrying a wave travelling towards right, created by a source vibrating at a frequency\[n\]. Consider the following statements I. The speed of the wave is \[4n\times ab\] II. The medium at \[a\] will be in the same phase as \[d\]after \[\frac{4}{3n}s\] III. The phase difference between \[b\] and \[e\] is \[\frac{3\pi }{2}\] Which of these statements are correct [AMU 2001] |
| A. | I, II and III |
| B. | II only |
| C. | I and III |
| D. | III only |
| Answer» D. III only | |
| 6750. |
The acceleration\[a\]of a particle undergoing S.H.M. is shown in the figure. Which of the labelled points corresponds to the particle being at ? xmax [AMU (Med.) 2000] |
| A. | 4 |
| B. | 3 |
| C. | 2 |
| D. | 1 |
| Answer» E. | |