1. Science .pmd

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iz’u-5 ijk/ofu D;k gS \What is meant by ultrasound ?iz’u-6 vuqizLFk ,oa vuqnS/;Z rjax esa nks & nks varj fyf[k, AGive two differences between transverse and longitudinal waves.iz’u-7 xSlksa dh rqyuk esa Bkslksa vkSj nzoksa esa /ofu dk osx vf/kd D;ksa gksrk gS \Why is the speed of sound higher in solids & liquids as compared togases ?iz’u-8 oLrqvksa dks lkQ djus ds fy;s ijk/ofu dk mi;ksx fdl izdkj djrs gSa \How can ultrasonic waves be used for cleaning of objects ?iz’u-9 vuqj.ku ls vki D;k le>rs gSa \What do you understand by reverberation viverberation ?iz’u-10 pekxknM+ fdl izdkj va/kdkj esa viuk f’kdkj
iz’u-16 fdlh rjax dk osx 330 m/s gS vkSj rjax dh vko`fr 10Hz gS] rks mldkrajx nS/;Z Kkr dhft, ACalculate the wavelength of a wave of frequency 10Hz and speed 330m/s.iz’u-17 fdlh rjax dh vko`fr 2kHz gS vkSj mldk rjax nS/;Z 35 m gS A ;g <strong>1.</strong>4 kmnwjh pyus esa fdruk le; ysxh \A waves of frequency 2kHz and wavelength 35m travels to a distance of2.4 km. Calculate the time taken.iz’u-18 ;fn fdlh rjax esa 1 sesa 5 J`ax o 5 xrZ curs gSA rks mldh vko`fr D;k gksxh \¼1 J`ax 1 xrZ] 1 rjax nS/;Z cukrs gSa½If crest and 5 trough are created 1s, calculate frequency of the wave.iz’u-19 ;fn fdlh /ofu dh izfr/ofu] 4 sds ckn lqukbZ nsrh gS rks /ofu L=ksr o vojks/kds chp dh nwjh Kkr dhft, A /ofu dh pky 344m/s yhft, AIf the echo is heard in 4 s after the sound, calculate the distance betweenthe source and reflecting surface. Speed of sound is 344 m/s.iz’u-20 nks cPps yksgs ds ikbZi ds fljksa ij cSBs gSa A ,d us fljs dks iRFkj ls ekj dj /ofumRiUu dhrks nlwjh rd /ofu ds ok;q ds ek/;e ls o yksgs ds ek/;e ls igqWapus dkvuqikr D;k gksxkA ok;q esa /ofu dh xfr 344 m/s ¼20 o C ½o yksgs esa 5130 m/s¼20 o C ½ yhft, ATwo children are sitting at two ends of an iron pipe, One of them strikes hisend of the pipe with a stone. Calculate the ratio of the time required by thesound to reach the ears of the other child through air and iron\. Speed ofsound in air = 344 m/s (at 20 0 C) and iron =5130 m/s (20 0 C).iz’u-21 ,d euq"; fdlh [kM+h pV~Vku ds ikl rkyh ctkrk gS vkSj mldh izfr/ofu 5 s dsi’pkr lqukbZ nsrh gS /ofu dh pky 346 ms -1 yh tk,] rks pV~Vku rFkk euq"; dschp dh nwjh Kkr dhft, AA person claps near a vertical rock. The echo of the clap is heard after 5 s.It the speed of sound is 346 m/s. Calculate the distance between theperson the rock(25)
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60. What is the general electronic
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(a) sp 3 (b) sp 3 d (c) sp 3 d 2 (d
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123. Which of the following is not
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140. In which container the concent
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