MCQOPTIONS
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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.
| 7751. |
The combination of ?NAND? gates shown here under (figure) are equivalent to [Haryana CEET 1996] |
| A. | An OR gate and an AND gate respectively |
| B. | An AND gate and a NOT gate respectively |
| C. | An AND gate and an OR gate respectively |
| D. | An OR gate and a NOT gate respectively. |
| Answer» B. An AND gate and a NOT gate respectively | |
| 7752. |
Which of the following logic gate is an universal gate [AIIMS 2005] |
| A. | OR |
| B. | NOT |
| C. | AND |
| D. | NOR |
| Answer» E. | |
| 7753. |
The truth-table given below is for which gate [CBSE PMT 1994, 98 2002; DPMT 2002; BCECE 2005] A 0 0 1 1 B 0 1 0 1 C 1 1 1 0 |
| A. | XOR |
| B. | OR |
| C. | AND |
| D. | NAND |
| Answer» E. | |
| 7754. |
The following truth table corresponds to the logic gate [BHU 1994; CPMT 2000; J & K CET 2004] A 0 0 1 1 B 0 1 0 1 X 0 1 1 1 |
| A. | NAND |
| B. | OR |
| C. | AND |
| D. | XOR |
| Answer» C. AND | |
| 7755. |
Sum of the two binary numbers \[{{(1000010)}_{2}}\] and \[{{(11011)}_{2}}\] is [DCE 2004] |
| A. | \[{{(111101)}_{2}}\] |
| B. | \[{{(111111)}_{2}}\] |
| C. | \[{{(101111)}_{2}}\] |
| D. | \[{{(111001)}_{2}}\] |
| Answer» B. \[{{(111111)}_{2}}\] | |
| 7756. |
Which gates is represented by this figure [DCE 2003] |
| A. | NAND gate |
| B. | AND gate |
| C. | NOT gate |
| D. | OR gate |
| Answer» B. AND gate | |
| 7757. |
The output of OR gate is 1 [CBSE PMT 2004] |
| A. | If both inputs are zero |
| B. | If either or both inputs are 1 |
| C. | Only if both input are 1 |
| D. | If either input is zero |
| Answer» C. Only if both input are 1 | |
| 7758. |
Which logic gate is represented by the following combination of logic gates [AIIMS 2004] |
| A. | OR |
| B. | NAND |
| C. | AND |
| D. | NOR |
| Answer» D. NOR | |
| 7759. |
A gate in which all the inputs must be low to get a high output is called [UPSEAT 2004] |
| A. | A NAND gate |
| B. | An inverter |
| C. | A NOR gate |
| D. | An AND gate |
| Answer» C. A NOR gate | |
| 7760. |
The output of a NAND gate is 0 [UPSEAT 2004] |
| A. | If both inputs are 0 |
| B. | If one input is 0 and the other input is 1 |
| C. | If both inputs are 1 |
| D. | Either if both inputs are 1 or if one of the inputs is 1 and the other 0 |
| Answer» D. Either if both inputs are 1 or if one of the inputs is 1 and the other 0 | |
| 7761. |
To get an output 1 from the circuit shown in the figure, the input must be [UPSEAT 2002] |
| A. | \[A=0,\,\,B=1,\,\,C=0\] |
| B. | \[A=1,\,\,B=0,\,\,C=0\] |
| C. | \[A=1,\,\,B=0,\,\,C=1\] |
| D. | \[A=1,\,\,B=1,\,\,C=0\] |
| Answer» D. \[A=1,\,\,B=1,\,\,C=0\] | |
| 7762. |
The combination of the gates shown in the figure below produces [DCE 2002] |
| A. | NOR gate |
| B. | OR gate |
| C. | AND gate |
| D. | XOR gate |
| Answer» C. AND gate | |
| 7763. |
Symbolrepresents [Kerala PMT 2001] |
| A. | NAND gate |
| B. | NOR gate |
| C. | NOT gate |
| D. | XNOR gate |
| Answer» C. NOT gate | |
| 7764. |
Given below are four logic gate symbol (figure). Those for OR, NOR and NAND are respectively [NSEP 1994] |
| A. | 1, 4, 3 |
| B. | 4, 1, 2 |
| C. | 1, 3, 4 |
| D. | 4, 2, 1 |
| Answer» D. 4, 2, 1 | |
| 7765. |
This symbol represents [CBSE PMT 1996] |
| A. | NOT gate |
| B. | OR gate |
| C. | AND gate |
| D. | NOR gate |
| Answer» B. OR gate | |
| 7766. |
The Boolean equation of NOR gate is [Haryana CET 2002] |
| A. | C = A + B |
| B. | \[C=\overline{A+B}\] |
| C. | C = A× B |
| D. | \[C=\overline{A\cdot B}\] |
| Answer» C. C = A× B | |
| 7767. |
What will be the input of A and B for the Boolean expression \[\overline{(A+B)}\,\cdot \,\overline{(A\cdot B)}=1\] [TNPCEE 2002] |
| A. | 0, 0 |
| B. | 0, 1 |
| C. | 1, 0 |
| D. | 1, 1 |
| Answer» B. 0, 1 | |
| 7768. |
The given truth table is of [AMU 1998; J & K CET 2002] A X 0 1 1 0 |
| A. | OR gate |
| B. | AND gate |
| C. | NOT gate |
| D. | None of above |
| Answer» D. None of above | |
| 7769. |
A gate has the following truth table [CBSE PMT 2000] P 1 1 0 0 Q 1 0 1 0 R 1 0 0 0 The gate is |
| A. | NOR |
| B. | OR |
| C. | NAND |
| D. | AND |
| Answer» E. | |
| 7770. |
A logic gate is an electronic circuit which [BHU 2000] |
| A. | Makes logic decisions |
| B. | Allows electrons flow only in one direction |
| C. | Works binary algebra |
| D. | Alternates between 0 and 1 values |
| Answer» B. Allows electrons flow only in one direction | |
| 7771. |
Given below are symbols for some logic gates The XOR gate and NOR gate respectively are [AFMC 1994] |
| A. | 1 and 2 |
| B. | 2 and 3 |
| C. | 3 and 4 |
| D. | 1 and 4 |
| Answer» C. 3 and 4 | |
| 7772. |
Angular width (b) of central maximum of a diffraction pattern on a single slit does not depend upon [DCE 2000; 01] |
| A. | Distance between slit and source |
| B. | Wavelength of light used |
| C. | Width of the slit |
| D. | Frequency of light used |
| Answer» B. Wavelength of light used | |
| 7773. |
What will be the angle of diffracting for the first minimum due to Fraunhoffer diffraction with sources of light of wave length 550 nm and slit of width 0.55 mm [Pb. PMT 2001] |
| A. | 0.001 rad |
| B. | 0.01 rad |
| C. | 1 rad |
| D. | 0.1 rad |
| Answer» B. 0.01 rad | |
| 7774. |
A diffraction is obtained by using a beam of red light. What will happen if the red light is replaced by the blue light [KCET 2000; BHU 2001] |
| A. | Bands will narrower and crowd full together |
| B. | Bands become broader and further apart |
| C. | No change will take place |
| D. | Bands disappear |
| Answer» B. Bands become broader and further apart | |
| 7775. |
A single slit of width\[a\]is illuminated by violet light of wavelength 400 nm and the width of the diffraction pattern is measured as y. When half of the slit width is covered and illuminated by yellow light of wavelength 600 nm, the width of the diffraction pattern is [KCET 2005] |
| A. | The pattern vanishes and the width is zero |
| B. | y / 3 |
| C. | 3y |
| D. | None of these |
| Answer» D. None of these | |
| 7776. |
A slit of size 0.15 cm is placed at 2.1 m from a screen. On illuminated it by a light of wavelength 5 ´ 10?5 cm. The width of central maxima will be [RPMT 1999] |
| A. | 70 mm |
| B. | 0.14 mm |
| C. | 1.4 mm |
| D. | 0.14 cm |
| Answer» D. 0.14 cm | |
| 7777. |
The width of the nth HPZ will be |
| A. | \[\sqrt{nb\lambda }\] |
| B. | \[\sqrt{b\lambda }\,[\sqrt{n}-\sqrt{n-1}]\] |
| C. | \[(\sqrt{n}\,-\,\sqrt{n-1})\] |
| D. | \[\frac{\sqrt{b\lambda }}{[\sqrt{n}\,-\sqrt{n-1}]}\] |
| Answer» C. \[(\sqrt{n}\,-\,\sqrt{n-1})\] | |
| 7778. |
Light of wavelength\[\lambda =5000\,\,{AA}\]falls normally on a narrow slit. A screen placed at a distance of 1 m from the slit and perpendicular to the direction of light. The first minima of the diffraction pattern is situated at 5 mm from the centre of central maximum. The width of the slit is |
| A. | 0.1 mm |
| B. | 1.0 mm |
| C. | 0.5 mm |
| D. | 0.2 mm |
| Answer» B. 1.0 mm | |
| 7779. |
In the far field diffraction pattern of a single slit under polychromatic illumination, the first minimum with the wavelength \[{{\lambda }_{1}}\] is found to be coincident with the third maximum at \[{{\lambda }_{2}}\]. So |
| A. | \[3{{\lambda }_{1}}=0.3{{\lambda }_{2}}\] |
| B. | \[3{{\lambda }_{1}}={{\lambda }_{2}}\] |
| C. | \[{{\lambda }_{1}}=3.5{{\lambda }_{2}}\] |
| D. | \[0.3{{\lambda }_{1}}=3{{\lambda }_{2}}\] |
| Answer» D. \[0.3{{\lambda }_{1}}=3{{\lambda }_{2}}\] | |
| 7780. |
To observe diffraction the size of an obstacle [CPMT 1982] |
| A. | Should be of the same order as wavelength |
| B. | Should be much larger than the wavelength |
| C. | Have no relation to wavelength |
| D. | Should be exactly \[\frac{\lambda }{2}\] |
| Answer» B. Should be much larger than the wavelength | |
| 7781. |
The condition for observing Fraunhofer diffraction from a single slit is that the light wavefront incident on the slit should be [MP PMT 1987] |
| A. | Spherical |
| B. | Cylindrical |
| C. | Plane |
| D. | Elliptical |
| Answer» D. Elliptical | |
| 7782. |
A light wave is incident normally over a slit of width\[24\times {{10}^{-5}}cm\]. The angular position of second dark fringe from the central maxima is 30o. What is the wavelength of light [RPET 1995] |
| A. | \[6000\,\,{AA}\] |
| B. | \[5000\,\,{AA}\] |
| C. | \[3000\,\,{AA}\] |
| D. | \[1500\,\,{AA}\] |
| Answer» B. \[5000\,\,{AA}\] | |
| 7783. |
Diffraction and interference of light suggest [CPMT 1995; RPMT 1998] |
| A. | Nature of light is electro-magnetic |
| B. | Wave nature |
| C. | Nature is quantum |
| D. | Nature of light is transverse |
| Answer» C. Nature is quantum | |
| 7784. |
A parallel monochromatic beam of light is incident normally on a narrow slit. A diffraction pattern is formed on a screen placed perpendicular to the direction of incident beam. At the first maximum of the diffraction pattern the phase difference between the rays coming from the edges of the slit is [IIT?JEE 1995, 98] |
| A. | 0 |
| B. | \[\frac{\pi }{2}\] |
| C. | \[\pi \] |
| D. | \[2\pi \] |
| Answer» E. | |
| 7785. |
Direction of the first secondary maximum in the Fraunhofer diffraction pattern at a single slit is given by (a is the width of the slit) [KCET 1999] |
| A. | \[a\sin \theta =\frac{\lambda }{2}\] |
| B. | \[a\cos \theta =\frac{3\lambda }{2}\] |
| C. | \[a\sin \theta =\lambda \] |
| D. | \[a\sin \theta =\frac{3\lambda }{2}\] |
| Answer» E. | |
| 7786. |
The penetration of light into the region of geometrical shadow is called [CPMT 1999; JIPMER 2000] |
| A. | Polarization |
| B. | Interference |
| C. | Diffraction |
| D. | Refraction |
| Answer» D. Refraction | |
| 7787. |
When light is incident on a diffraction grating the zero order principal maximum will be [KCET 2004] |
| A. | One of the component colours |
| B. | Absent |
| C. | Spectrum of the colours |
| D. | White |
| Answer» E. | |
| 7788. |
The diffraction effect can be observed in [J & K CET 2004] |
| A. | Only sound waves |
| B. | Only light waves |
| C. | Only ultrasonic waves |
| D. | Sound as well as light waves |
| Answer» E. | |
| 7789. |
When a compact disc is illuminated by a source of white light. Coloured 'lanes' are observed. This is due to [DCE 2003; AIIMS 2004] |
| A. | Dispersion |
| B. | Diffraction |
| C. | Interference |
| D. | Refraction |
| Answer» C. Interference | |
| 7790. |
In a diffraction pattern by a wire, on increasing diameter of wire, fringe width [RPMT 1998] |
| A. | Decreases |
| B. | Increases |
| C. | Remains unchanged |
| D. | Increasing or decreasing will depend on wavelength |
| Answer» B. Increases | |
| 7791. |
The bending of beam of light around corners of obstacles is called [NCERT 1990; AFMC 1995; RPET 1997; RPMT 1997; CPMT 1999; JIPMER 2000] |
| A. | Reflection |
| B. | Diffraction |
| C. | Refraction |
| D. | Interference |
| Answer» C. Refraction | |
| 7792. |
Light of wavelength \[589.3\,nm\] is incident normally on the slit of width \[0.1\,mm.\] What will be the angular width of the central diffraction maximum at a distance of \[1\,m\] from the slit [BHU (Med.) 1999] |
| A. | \[0.68{}^\circ \] |
| B. | \[1.02{}^\circ \] |
| C. | \[0.34{}^\circ \] |
| D. | None of these |
| Answer» B. \[1.02{}^\circ \] | |
| 7793. |
Conditions of diffraction is [RPET 2001] |
| A. | \[\frac{a}{\lambda }=1\] |
| B. | \[\frac{a}{\lambda }>>1\] |
| C. | \[\frac{a}{\lambda }<<1\] |
| D. | None of these |
| Answer» B. \[\frac{a}{\lambda }>>1\] | |
| 7794. |
In the experiment of diffraction at a single slit, if the slit width is decreased, the width of the central maximum [KCET 2001] |
| A. | Increases in both Fresnel and Fraunhofer diffraction |
| B. | Decreases both in Fresnal and Fraunhofer diffraction |
| C. | Increases in Fresnel diffraction but decreases in Fraunhofer diffraction |
| D. | Decreases in Fresnel diffraction but increases is Fraunofer diffraction. |
| Answer» B. Decreases both in Fresnal and Fraunhofer diffraction | |
| 7795. |
Red light is generally used to observe diffraction pattern from single slit. If blue light is used instead of red light, then diffraction pattern [RPMT 2001; BCECE 2005; CPMT 2005] |
| A. | Will be clearer |
| B. | Will contract |
| C. | Will expanded |
| D. | Will not be visualized |
| Answer» C. Will expanded | |
| 7796. |
A zone plate of focal length \[60\,cm,\] behaves as a convex lens, If wavelength of incident light is \[6000\,\,{AA},\] then radius of first half period zone will be [RPMT 2001] |
| A. | \[36\times {{10}^{-8}}m.\] |
| B. | \[6\times {{10}^{-8}}m.\] |
| C. | \[\sqrt{6}\times {{10}^{-8}}m.\] |
| D. | \[6\times {{10}^{-4}}m.\] |
| Answer» E. | |
| 7797. |
A plane wavefront \[(\lambda =6\times {{10}^{-7}}m)\] falls on a slit \[0.4\,mm\] wide. A convex lens of focal length \[0.8\,m\] placed behind the slit focusses the light on a screen. What is the linear diameter of second maximum [RPMT 2001] |
| A. | \[6\,mm\] |
| B. | \[12\,mm\] |
| C. | \[3\,mm\] |
| D. | \[9\,mm\] |
| Answer» B. \[12\,mm\] | |
| 7798. |
In Fresnel diffraction, if the distance between the disc and the screen is decreased, the intensity of central bright spot will [RPMT 2002] |
| A. | Increase |
| B. | Decrease |
| C. | Remain constant |
| D. | None of these |
| Answer» C. Remain constant | |
| 7799. |
Which statement is correct for a zone plate and a lens [RPMT 2002] |
| A. | Zone plate has multi focii whereas lens has one |
| B. | Zone plate has one focus whereas lens has multiple focii |
| C. | Both are correct |
| D. | Zone plate has one focus whereas a lens has infinite |
| Answer» B. Zone plate has one focus whereas lens has multiple focii | |
| 7800. |
Yellow light is used in single slit diffraction experiment with slit width 0.6 mm. If yellow light is replaced by X-rays then the pattern will reveal [IIT-JEE (Screening) 1999; MP PMT 2002; KCET 2003] |
| A. | That the central maxima is narrower |
| B. | No diffraction pattern |
| C. | More number of fringes |
| D. | Less number of fringes |
| Answer» C. More number of fringes | |