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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.
| 6651. |
Which of the following is the nm = T graph for a perfectly black body (nm =maximum frequency of radiation) [RPMT 1996] |
| A. | A |
| B. | B |
| C. | C |
| D. | D |
| Answer» C. C | |
| 6652. |
The temperature-entropy diagram of a reversible engine cycle is given in the figure. Its efficiency is [AIEEE 2005] |
| A. | \[1/3\] |
| B. | \[2/3\] |
| C. | \[1/2\] |
| D. | \[1/4\] |
| Answer» B. \[2/3\] | |
| 6653. |
A battery consists of a variable number 'n' of identical cells having internal resistances connected in series. The terminals of battery are short circuited and the current i is measured. Which of the graph below shows the relation ship between i and n |
| A. | |
| B. | |
| C. | |
| D. | |
| Answer» E. | |
| 6654. |
The diagram shows the change x in the length of a thin uniform wire caused by the application of stress F at two different temperatures T1 and T2. The variations shown suggest that [CPMT 1988] |
| A. | \[{{T}_{1}}>{{T}_{2}}\] |
| B. | \[{{T}_{1}}<{{T}_{2}}\] |
| C. | \[{{T}_{1}}={{T}_{2}}\] |
| D. | None of these |
| Answer» B. \[{{T}_{1}}<{{T}_{2}}\] | |
| 6655. |
A particle, initially at rest on a frictionless horizontal surface, is acted upon by a horizontal force which is constant in size and direction. A graph is plotted between the work done (W) on the particle, against the speed of the particle, (v). If there are no other horizontal forces acting on the particle the graph would look like |
| A. | |
| B. | |
| C. | |
| D. | |
| Answer» E. | |
| 6656. |
If the thermionic current density is J and emitter temperature is T then the curve between \[\frac{J}{{{T}^{2}}}\] and \[\frac{1}{T}\] will be |
| A. | |
| B. | |
| C. | |
| D. | |
| Answer» D. | |
| 6657. |
In the following diagram if V2 > V1 then |
| A. | \[{{\lambda }_{1}}=\sqrt{{{\lambda }_{2}}}\] |
| B. | \[{{\lambda }_{1}}<{{\lambda }_{2}}\] |
| C. | \[{{\lambda }_{1}}={{\lambda }_{2}}\] |
| D. | \[{{\lambda }_{1}}>{{\lambda }_{2}}\] |
| Answer» E. | |
| 6658. |
The i - n curve for anti-resonant circuit is |
| A. | |
| B. | |
| C. | |
| D. | |
| Answer» C. | |
| 6659. |
Switch S of the circuit shown in figure. is closed at t = 0. If e denotes the induced emf in L and i, the current flowing through the circuit at time t, which of the following graphs is correct |
| A. | |
| B. | |
| C. | |
| D. | |
| Answer» D. | |
| 6660. |
In the figure, the distribution of energy density of the radiation emitted by a black body at a given temperature is shown. The possible temperature of the black body is |
| A. | 1500 K |
| B. | 2000 K |
| C. | 2500 K |
| D. | 3000 K |
| Answer» C. 2500 K | |
| 6661. |
Carnot cycle (reversible) of a gas represented by a Pressure-Volume curve is shown in the diagram Consider the following statements I. Area ABCD = Work done on the gas II. Area ABCD = Net heat absorbed III. Change in the internal energy in cycle = 0 Which of these are correct [AMU (Med.) 2001] |
| A. | I only |
| B. | II only |
| C. | II and III |
| D. | I, II and III |
| Answer» D. I, II and III | |
| 6662. |
In an RC circuit while charging, the graph of in i versus time is as shown by the dotted line in the diagram figure, where i is the current. When the value of the resistance is doubled, which of the solid curve best represents the variation of in i versus time [IIT-JEE (Screening) 2004] |
| A. | P |
| B. | Q |
| C. | R |
| D. | S |
| Answer» C. R | |
| 6663. |
The V-i graph for a conductor makes an angle \[\theta \] with V-axis. Here V denotes the voltage and i denotes current. The resistance of conductor is given by |
| A. | \[\sin \theta \] |
| B. | \[\cos \theta \] |
| C. | \[\tan \theta \] |
| D. | \[\cot \theta \] |
| Answer» E. | |
| 6664. |
Which one of the following is the Young?s modulus (in N/m2) for the wire having the stress-strain curve shown in the figure |
| A. | \[24\times {{10}^{11}}\] |
| B. | \[8.0\times {{10}^{11}}\] |
| C. | \[10\times {{10}^{11}}\] |
| D. | \[2.0\times {{10}^{11}}\] |
| Answer» E. | |
| 6665. |
The displacement-time graph of moving particle is shown below The instantaneous velocity of the particle is negative at the point [CBSE PMT 1994] |
| A. | D |
| B. | F |
| C. | C |
| D. | E |
| Answer» E. | |
| 6666. |
The value of stopping potential in the following diagram |
| A. | ? 4V |
| B. | ? 3 V |
| C. | ? 2V |
| D. | ? 1 V |
| Answer» B. ? 3 V | |
| 6667. |
The resonance point in \[{{X}_{L}}-f\] and \[{{X}_{C}}-f\] curves is |
| A. | P |
| B. | Q |
| C. | R |
| D. | S |
| Answer» D. S | |
| 6668. |
In an L?R circuit connected to a battery the rate at which energy is stored in the inductor is plotted against time during the growth of the current in the circuit. Which of the following best represents the resulting curve |
| A. | |
| B. | |
| C. | |
| D. | |
| Answer» B. | |
| 6669. |
The displacement-time graphs for two sound waves A and B are shown in the figure, then the ratio of their intensities \[{{I}_{A}}/{{I}_{B}}\] is equal to |
| A. | 1 : 4 |
| B. | 1 : 16 |
| C. | 1 : 2 |
| D. | 1 : 1 |
| Answer» E. | |
| 6670. |
A body performs S.H.M. Its kinetic energy K varies with time t as indicated by graph |
| A. | |
| B. | |
| C. | |
| D. | |
| Answer» B. | |
| 6671. |
A cylindrical conductor has uniform cross-section. Resistivity of its material increase linearly from left end to right end. If a constant current is flowing through it and at a section distance x from left end, magnitude of electric field intensity is E, which of the following graphs is correct |
| A. | |
| B. | |
| C. | |
| D. | |
| Answer» C. | |
| 6672. |
The diagram shows stress v/s strain curve for the materials A and B. From the curves we infer that [AIIMS 1987] |
| A. | A is brittle but B is ductile |
| B. | A is ductile and B is brittle |
| C. | Both A and B are ductile |
| D. | Both A and B are brittle |
| Answer» C. Both A and B are ductile | |
| 6673. |
A force \[F\]acting on an object varies with distance \[x\]as shown here. The force is in newton and \[x\] in metre. The work done by the force in moving the object from \[x=0\]to \[x=6m\] is [CBSE PMT 2005] |
| A. | 4.5 J |
| B. | 13.5 J |
| C. | 9.0 J |
| D. | 18.0 J |
| Answer» C. 9.0 J | |
| 6674. |
Velocity-time curve for a body projected vertically upwards is [EAMCET (Med.) 1995; AIIMS 1999; Pb. PMT 2004; BHU 2004] |
| A. | Parabola |
| B. | Ellipse |
| C. | Hyperbola |
| D. | Straight line |
| Answer» E. | |
| 6675. |
The point representing the cut off grid voltage on the mutual characteristic of triode is |
| A. | S |
| B. | R |
| C. | O |
| D. | P |
| Answer» E. | |
| 6676. |
The graph which represents the correct variation of logarithm of activity (log A) versus time, in figure is |
| A. | A |
| B. | B |
| C. | C |
| D. | D |
| Answer» E. | |
| 6677. |
The correct curve between the stopping potential (V) and intensity of incident light (I) is |
| A. | |
| B. | |
| C. | |
| D. | |
| Answer» C. | |
| 6678. |
The vector diagram of current and voltage for a circuit is as shown. The components of the circuit will be |
| A. | LCR |
| B. | LR |
| C. | LCR or LR |
| D. | None of these |
| Answer» D. None of these | |
| 6679. |
The most appropriate magnetization M versus magnetising field H curve for a paramagnetic substance is |
| A. | A |
| B. | B |
| C. | C |
| D. | D |
| Answer» B. B | |
| 6680. |
A wave is travelling along a string. At an instant, shape of the string is as shown in fig. At this instant, point A is moving upwards. Which of the following statements is/are correct |
| A. | The wave is travelling to the right |
| B. | Displacement amplitude of the wave is equal to displacement of B at this instant |
| C. | At this instant velocity of C is also directed upwards |
| D. | Phase difference between A and C may be equal to \[\frac{\pi }{2}\] |
| Answer» C. At this instant velocity of C is also directed upwards | |
| 6681. |
The variation of potential energy of harmonic oscillator is as shown in figure. The spring constant is |
| A. | 1 ´102 N/m |
| B. | 150 N/m |
| C. | 0.667 ´ 102 N/m |
| D. | 3 ´ 102 N/m |
| Answer» C. 0.667 ´ 102 N/m | |
| 6682. |
A cyclic process for 1 mole of an ideal gas is shown in figure in the V-T, diagram. The work done in AB, BC and CA respectively |
| A. | \[0,\,R{{T}_{2}}\ln \left( \frac{{{V}_{1}}}{{{V}_{2}}} \right)\,,\,R\,({{T}_{1}}-{{T}_{2}})\] |
| B. | \[R({{T}_{1}}-{{T}_{2}}),\,0,\,R{{T}_{1}}\ln \frac{{{V}_{1}}}{{{V}_{2}}}\] |
| C. | \[0,\,R{{T}_{2}}\ln \left( \frac{{{V}_{2}}}{{{V}_{1}}} \right)\,,\,R\,({{T}_{1}}-{{T}_{2}})\] |
| D. | \[0,\,R{{T}_{2}}\ln \left( \frac{{{V}_{2}}}{{{V}_{1}}} \right)\,,\,R\,({{T}_{2}}-{{T}_{1}})\] |
| Answer» D. \[0,\,R{{T}_{2}}\ln \left( \frac{{{V}_{2}}}{{{V}_{1}}} \right)\,,\,R\,({{T}_{2}}-{{T}_{1}})\] | |
| 6683. |
Two substances A and B of equal mass m are heated at uniform rate of 6 cal s?1 under similar conditions. A graph between temperature and time is shown in figure. Ratio of heat absorbed \[{{H}_{A}}/{{H}_{B}}\] by them for complete fusion is |
| A. | \[\frac{9}{4}\] |
| B. | \[\frac{4}{9}\] |
| C. | \[\frac{8}{5}\] |
| D. | \[\frac{5}{8}\] |
| Answer» D. \[\frac{5}{8}\] | |
| 6684. |
The V-i graph for a conductor at temperature \[{{T}_{1}}\] and \[{{T}_{2}}\] are as shown in the figure. \[({{T}_{2}}-{{T}_{1}})\] is proportional to |
| A. | \[\cos 2\theta \] |
| B. | \[\sin \theta \] |
| C. | \[\cot 2\theta \] |
| D. | \[\tan \theta \] |
| Answer» D. \[\tan \theta \] | |
| 6685. |
The value of force constant between the applied elastic force F and displacement will be |
| A. | \[\sqrt{3}\] |
| B. | \[\frac{1}{\sqrt{3}}\] |
| C. | \[\frac{1}{2}\] |
| D. | \[\frac{\sqrt{3}}{2}\] |
| Answer» C. \[\frac{1}{2}\] | |
| 6686. |
In the following graph, distance travelled by the body in metres is [EAMCET 1994] |
| A. | 200 |
| B. | 250 |
| C. | 300 |
| D. | 400 |
| Answer» B. 250 | |
| 6687. |
In Fig. X represents time and Y represent activity of a radioactive sample. Then the activity of sample, varies with time according to the curve |
| A. | A |
| B. | B |
| C. | C |
| D. | D |
| Answer» C. C | |
| 6688. |
In pure inductive circuit, the curves between frequency f and reciprocal of inductive reactance 1/XL is |
| A. | |
| B. | |
| C. | |
| D. | |
| Answer» D. | |
| 6689. |
A flexible wire bent in the form of a circle is placed in a uniform magnetic field perpendicular to the plane of the coil. The radius of the coil changes as shown in figure. The graph of induced emf in the coil is represented by |
| A. | |
| B. | |
| C. | |
| D. | |
| Answer» C. | |
| 6690. |
An observer starts moving with uniform acceleration a toward a stationary sound source emitting a whistle of frequency n. As the observer approaches source, the apparent frequency, heard by the observer varies with time as |
| A. | |
| B. | |
| C. | |
| D. | |
| Answer» C. | |
| 6691. |
Acceleration A and time period T of a body in S.H.M. is given by a curve shown below. Then corresponding graph, between kinetic energy (K.E.) and time t is correctly represented by |
| A. | |
| B. | |
| C. | |
| D. | |
| Answer» B. | |
| 6692. |
In the following indicator diagram, the net amount of work done will be |
| A. | Positive |
| B. | Negative |
| C. | Zero |
| D. | Infinity |
| Answer» C. Zero | |
| 6693. |
Which of the substances A, B or C has the highest specific heat ? The temperature vs time graph is shown |
| A. | A |
| B. | B |
| C. | C |
| D. | All have equal specific heat |
| Answer» D. All have equal specific heat | |
| 6694. |
Three identical capacitors are given a charge Q each and they are then allowed to discharge through resistance R1, R2 and R3. Their charges, as a function of time shown in the graph below. The smallest of the three resistance is |
| A. | \[{{R}_{\text{3}}}\] |
| B. | \[{{R}_{\text{2}}}\] |
| C. | \[{{R}_{\text{1}}}\] |
| D. | Cannot be predicted |
| Answer» D. Cannot be predicted | |
| 6695. |
The potential energy U between two molecules as a function of the distance X between them has been shown in the figure. The two molecules are [CPMT 1986, 88, 91] |
| A. | Attracted when x lies between A and B and are repelled when X lies between B and C |
| B. | Attracted when x lies between B and C and are repelled when X lies between A and B |
| C. | Attracted when they reach B |
| D. | Repelled when they reach B |
| Answer» C. Attracted when they reach B | |
| 6696. |
The adjoining diagram shows the velocity versus time plot for a particle. The work done by the force on the particle is positive from |
| A. | A to B |
| B. | B to C |
| C. | C to D |
| D. | D to E |
| Answer» B. B to C | |
| 6697. |
For the velocity-time graph shown in figure below the distance covered by the body in last two seconds of its motion is what fraction of the total distance covered by it in all the seven seconds [MP PMT/PET 1998; RPET 2001] |
| A. | \[\frac{1}{2}\] |
| B. | \[\frac{1}{4}\] |
| C. | \[\frac{1}{3}\] |
| D. | \[\frac{2}{3}\] |
| Answer» C. \[\frac{1}{3}\] | |
| 6698. |
In a negative logic the following wave form corresponds to the |
| A. | 0000000000 |
| B. | 0101101000 |
| C. | 1111111111 |
| D. | 1010010111 |
| Answer» E. | |
| 6699. |
For a photoelectric cell the graph showing the variation of cut of voltage (Vo) with frequency (n) of incident light is best represented by [DCE 2001; MP PET 2003] |
| A. | |
| B. | |
| C. | |
| D. | |
| Answer» E. | |
| 6700. |
The graph between the instantaneous concentration \[(N)\] of a radioactive element and time \[(t)\] is |
| A. | |
| B. | |
| C. | |
| D. | |
| Answer» E. | |