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This section includes 7 InterviewSolutions, each offering curated multiple-choice questions to sharpen your Current Affairs knowledge and support exam preparation. Choose a topic below to get started.
| 2. |
{:("ColumnA","ColumnB"),(A. "Periodic motion",a."maximum displacement of vibrating particle from its mean position"),(B."Vibrtory motion" ,b."The pistion of a motor car engine at uniform car engine at uniform speed"),(C."Body at rest" ,c."Non- uniform motion"),(D."Amplitude",d.18//5 kmh^(-1)),(E."Variable speed" ,e."OScillating objects undergo change in shape of size"),(F. 1ms^(-1) , f. ("Total displacement")/("Total time")),(G."Average velocity" ,g. "Zero velocity"):} |
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| 3. |
Answer the following question What is the physical quantity that decided the flow of heat energy? |
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| 4. |
The frequency of sound waves which can be heard by human is _______. |
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Answer» LESS than 20 HZ |
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| 6. |
The image formed by a plane mirror is ______. |
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Answer» virtual (2) It is an ERECT image. (3) The HEIGHT of the image is the same as that of the object. |
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| 7. |
A bimetallic strip made up of copper and brass as shown below. Which among the following statements is/true about the bimetallic strip? (Expansion of brass is more than expansion copper? |
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Answer» if this BIMETALLIC strip is HEATED brass takes outeredge of the bend and copper takes the INNER edge of the bend |
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| 8. |
Ravinder was inspired by reading the autobiography of Thomas Alva Edison and changed a portion of his room into a laboratory. In his laboratory he per-formed and activity that demonstrates both 'heating effect' and 'magnetic effect' of electric current. He connected different components with different wires and the connections are represented by the following circuit diagram. To his disappointment, he was not successful in his effort. Observe the circuit and suggest modifications to make his effort successful. |
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Answer» SOLUTION :(1) He has to change the silk thread used to con-nect one of the BULBS with a battery because silk thread is not a conducting wire. (2) He has to replace 'fused' bulb with a good nor-mal bulb to MAKE the CIRCUIT closed. (3) Switch to be made `'ON'`. |
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| 9. |
Which of the following materials is the best absorber of sound ? |
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Answer» metallic sheet |
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| 10. |
If a bus travels a distance of 30 km in 45 minutes. What will be its speed in: km//"min " |
| Answer» SOLUTION :Speed = `30 KM//45` minutes = 0.67 `"km"//"minute"` | |
| 11. |
To transmit heat from one object to another by conduction the two object should be in contact |
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| 12. |
What is the difference between an oscillatory and a vibratory motion ? |
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| 13. |
When an object of height 'h_(o)' is placed in front of a pinhole camera, an image of height 'h_(i)' is formed. If the object is placed at a distance 'u' from the pinahole camera, arrange the following steps to determine the widht of the camera in proper sequence. (A) Determine the magnification (m). (B) Note the value of h_(o)andh_(1). (C) Determine the image distance (v). (D) Substitute the value of 'm' and 'u' in m=(v)/(n) where u is the object distance. (E) Take the value of 'v' as the width of the camera. |
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Answer» BDACE |
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| 14. |
Answer the following question why do we cover our bodies with blankets at night in winter? |
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| 15. |
A light ray incidents at an angle 'l' on a plane mirror and undergoes reflection. Arrange the following steps in sequential order to calculate the angle of deviatino of the light ray. The angle between the incident ray and the extended light ray is 180^(@). In case of reflection, the angle of incidence (i) is equal to the angle of reflection (r). Then the angle between the incident ray and the reflected ray is 2i. Draw an imaginary line, extending the incident light ray, which reprsesnts the actual path of the light ray. The angle of deviation is the angle between the reflected light ray and the actual path of the light ray, i.e., 180^(@)-2i. |
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Answer» BADC |
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| 16. |
Density of keerosene is less than the density of water. |
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| 17. |
Answer the following question Why is the handle of a kettle covered with plastic? |
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| 18. |
Match the following |
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Answer» `ARARRB,Brarra,Crarrd,Drarrc` B-C Anomalous EXPANSIONS of water was demonstrated by HOPE's APPARATUS c- By releasing heat energy a gaseous substacne converts in to its liquid state D-a Thermal expansions ofsolids was demonstrated by Gravensand's ring and ball experiment |
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| 19. |
Match the following |
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Answer» `Prarrq,Qrarrs,Rrarrp,Srarrr` Q-p A small gap is left while laying the rail tracks is an APPLICATION of thermal expansion of solids R-q Freezing point of a substacne is numerically equal to the MELTING point of the substance S-r MIXTURE of common SALT and ice is called freezing mixture used to produce low temperture |
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| 20. |
What are the laws of reflection ? |
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Answer» the ANGLE of INCIDENCE (i) = the angle of reflection (R). |
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| 21. |
Loudness of a sound in the range of 5 dB - 8 dB is ___________. |
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Answer» not audiable |
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| 22. |
Heat transfer in solids is by.......... |
| Answer» SOLUTION :CONDUCTION | |
| 23. |
Two identical containers A and B are filled with two different liquids of equal masses. The level of the liquid in container A is found to be one-fourth of the level of the liquid in containerB.What is the ratio of thedensity of two liquids? If the density of he liquid in the container A is 2 " g " cm^(-3), then find the density of the mixture of the two liquids. |
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Answer» Solution :Mass of liquid A, `(m_(A))` = mass of liquid B, `(m_(B))` VOLUME = `area xx height` Area of cross section of A= Area cross section of B Height of liquid column A = `1/4 xx` " height "ofliquid column A = `1/4 " (Volume of B) " DENSITY of`"mass/volume"``(density " of " A)/(density " of " B) = m_(A)/V_(A)xx V_(B)/m_(B)=V_(B)/V_(B)=4/1=4 :1` If density of A is 2 " g " `cm^(-3)`,then density of B = " g " `cm^(-3)` = 0.5" g " `cm^(-3)` Density of mixture = `"mass of mixture"/"volume of mixture"` `(m_(A)+m_(B))/(v_(A)+v_(B))=(m_(A)=m_(A))/(v_(A)=4v_(A)) ( :. m_(B) = m_(A) and v_(B)= 4v_(A))` `(2m_(A))/(5v_(A)) = (2xx d_(A)xx v_(A))/(5V_(A)` `(2XX2)/5=4/5=0.8 " g "cm^(-3)` |
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| 24. |
The temperature of an object is 25^@ C. What will be its temperature in ""^@F? |
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Answer» Solution :`""^@F= (9//5) XX ""^(@)C + 32` `""^(@)F = (9//5) xx 25 + 32` `= 45 + 32` `= 77^@ F` |
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| 25. |
A patient's temperature is found to be 103^@F. What is her temperature in degree Celsius? |
| Answer» SOLUTION :`39.4^@ C` | |
| 26. |
If a body covers equal distances in equal intervals of time, the motion is said to be : |
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Answer» uniform |
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| 27. |
When an object is placed between two parallel mirrors, then number of images formed are |
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Answer» 2 `THETA=0^(@),n=(360^(@))/(theta)-1=(360^(@))/(0)-1=oo-1=oo` Where n = number of images formed. `theta`= ANGLE between the mirrors. |
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| 28. |
The funnel in a seed drill is used to _________ |
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Answer» hold the SEEDS |
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| 29. |
Define day and year. How do watches and clocks measure time ? Explain. |
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| 30. |
Calculate the amount of heat energy required to increase the temperature of 250 g of water from 27^(@)C to 67^(@)C (Specific heat capacity of wateris 1 cal g^(-1@)C^(-1)) |
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Answer» Solution :Given mass of water =250 g Change intemperature `Delta`=final temperature -intitial temperature =`67^(@)C-27^(@)C=40^(@)C=40^(@)C` SPECIFIC heat CAPACITY of water =1 cal `gal^(-1).^@C^(-1)` Heat ENERGY supplied ,Q =`MsDelta t` Q=`250xx1xx40`=10000 cal =kCal |
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| 31. |
When a positively charged and another negtively charged bodies with equal magnitude of charge are brought simultaneously in contact with the cap of a positively charged electroscope, then the strips |
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Answer» move apart. |
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| 32. |
The strength of magnetic field of an electromagnet is increased by inserting a core of ............... |
| Answer» SOLUTION :SOFT IRON | |
| 33. |
The image formed by a plane mirror is upright. |
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| 35. |
Chanukya was eager to know the time taken by sound to travel the same distance in water and air. So, he set a body on vibration with a frequency of 250 Hz in air and the sound produced bu this is heard at a distance of 175 m. Now if the body is vibrated in water, what is the difference in the time taken by the sound to travel the same distance in water and air ? (The velocity of sound in air and water is 350 ms^(-1) and 1400 ms^(-1), respectively). |
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Answer» SOLUTION :(i) Frequency of body, (n) = 250 Hz. Distance, (d) = 175 m. Speed (VELOCITY) of sound (V) `= 350 ms^(-1)`. `THEREFORE` Time taken by the sound to travel 175 m in air `= ("distance")/("speed") = (175 m)/(350 ms^(-1)) = 1/2 s.` (ii) When it is vibrated in water, the NUMBER of VIBRATIONS completed in 1 second (i.e., frequency) is the same `therefore` n = 250 Hz. Distance, (d) = 175 m Speed of sound in water `(v) = 1400 ms^(-1)`. `therefore` Time taken by sound to travel 175 m in water (t). `= (175 m)/(1400 ms^(-1)) = 1//8 s` `therefore` Time difference `= (1/2 - 1/8)s` `= (1/2 - 1/8)s = (4/8 - 1/8)s = 3/8s`. |
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| 36. |
The more is the energy spent to set a body into vibration, |
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Answer» the louder is the sound produced. |
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| 37. |
Dinesh, who is fond of music, vibrates a glass with a spoon. If he fills the glass with water, will there be any change in any of the characteristics of the sound produced ? Explain. |
| Answer» SOLUTION :Because of the presence of water inside the glass, the AMPLITUDE of vibration decreases, and hence, the LOUDNESS of SOUND decreases. | |
| 38. |
Which of the following do not usethe pricinpleof 'chemical effect of electric current' ? |
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Answer» Telephone |
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| 39. |
Answer the following question What is the thermometer used to measure the temperature of a furnace? |
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| 40. |
Metals are ...................... of heat. |
| Answer» SOLUTION :CONDUCTORS | |
| 41. |
The motion of a simple pendulum is an example of oscillatory motion. ? |
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| 42. |
{:(,"Column A",,, "Column B"),(A., 1 MHz, ( ), a., 10^(6) Hz),(B., 340 ms^(-1), ( ), b., "Decibel"),(C., "Music", ( ), c., "Velocity of sound in air at" 20^(@)C),(D., "Loudness of sound", ( ), d., 50 Hz " to " 80","000 Hz),(E., "Bats", ( ), e., "Pleasant sensation of hearing"):} |
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| 43. |
By taking suitable example, describe hwo a distancetime graph is plotted. |
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| 44. |
The temperatures of two bodies differ by 10^@Con the Celsius scale. How much will they differ on the Fahrenheit scale |
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Answer» SOLUTION :100 divisions on the Celsius SCALE = 180 divisions on the Fahrenheit scale ` THEREFORE `10 divisions on the Celsius scale ` = 180/100 xx 10= 18`divisions in the Fahrenheit scale. Thus, the temperature of two bodies will differ by `18^@F`on the Fahrenheit scale. |
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| 45. |
why an ordinary hammer can be used to remove nails from a wall or a piece of wood |
| Answer» SOLUTION :Hammer with a fork is USED to remvoe NAIS from a wall or piece of WOOD | |
| 46. |
Prahar took two identical heating elements and con-nected them to a battery in two different ways as shown in the figure. Whenhe switched ON the switch, is the heat developed in each element the same or different in both the cases ? |
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Answer» SOLUTION :Heat generated in two ideantical heating elements DEPENDS on the current that flows through them. More the current that passes through an element, MOREIS the heat generated. In. Fig (A) heating elements are connected in series and in Fig(B) heating elements are connected in par-allel. the current that flows through the heating ele-ments when they are connected in series is less than the current that flow through them when they are connected in parallel. As such more heat is generated when they are connected as shown in the Fig. (B). |
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| 47. |
Define different kinds of velocity . Give one example of each kind. |
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| 48. |
Three identical cells of e.m.f. 1.5 V are connected in parallel. The total e.m.f. of the combination is "_____". |
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Answer» 1.5 |
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| 49. |
The rare-view mirror used in vehicles is a convex mirror. |
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