Tiêu đề Work, power, energy & Periodic properties Daily-5 (Set-A) Solution.pdf ✅

3 = 1.2  5 = 6 m/s 18. 500 gm Gi GKwU eid LÐ h D”PZv †_‡K GKwU Rjvk‡q coj Ges 50% M‡j †Mj| h = ? 5  105 3.36  9.8 m 9.8  3.36 2  105 m 3.36  105 2  9.8 m 3.36  4 98  105 m DËi: 3.36  105 2  9.8 m e ̈vL ̈v: h D”PZvq wefekw3 = mgh Rjvk‡q covi ci fi M‡j n‡jv, m1 = 50m 100 = m 2  mgh = m 2 lf  h = lf 2g = 3.36  105 2  9.8 19. wb‡Pi †KvbwU mwVK? (hLb MwZkw3 aaæe) p m p m p t p m DËi: p m e ̈vL ̈v: Ek = p 2 2m  p 2 = 2mEk  p 2  2m 20. 1 kg f‡ii GKwU e ̄` evwn ̈K e‡ji cÖfv‡e 2 m e ̈vmv‡a©i e„ËvKvi c‡_ 2 rad/s2 †KŠwYK Z¡i‡Y Pj‡Q| hw` e ̄`wU w ̄’ive ̄’v n‡Z Pjv ïiæ K‡i, Z‡e 5 s c‡i evwn ̈K e‡ji ZvrÿwYK ÿgZv KZ? 80 W 90 W 100 W 120 W DËi: 80 W e ̈vL ̈v:  F v a = R = 2  2 = 4 m/s2 F = ma = 1  4 = 4 N v = u + at = 4  5 = 20 m/s P = Fv = 4  20 = 80 W 21. CGS c×wZ‡Z Kv‡Ri GKK †KvbwU? Joule Ft-Poundal erg N.m DËi: erg e ̈vL ̈v: Kv‡Ri †ÿ‡Î, SI c×wZ‡Z GKK  N.m ev J SI c×wZ‡Z AwfKl©xq GKK  kg–m CGS c×wZ‡Z GKK  erg FPS c×wZ‡Z Kv‡Ri GKK  ft – poundal 22. cwieZ©bkxj e‡ji †ÿ‡ÎÑ ïay e‡ji gvb cwiewZ©Z nq ïay e‡ji w`K cwiewZ©Z nq e‡ji gvb I w`K DfqB cwiewZ©Z nq e‡ji gvb I w`K DfqB AcwiewZ©Z _v‡K DËi: e‡ji gvb I w`K DfqB cwiewZ©Z nq e ̈vL ̈v: ej GKwU †f±i ivwk| ZvB Gi gvb ev w`K ev Df‡qi cwie‡Z© e‡ji cwieZ©b nq| 23. k w ̄úas aaæe‡Ki GKwU w ̄úas‡K †U‡b j¤^v Kiv nj| wØZxq GKwU w ̄úas‡K Gi A‡a©K cwigvY j¤^v Ki‡Z wØ ̧Y KvR Ki‡Z nq| wØZxq w ̄úas-Gi w ̄úas aaæeK KZ? k 2k 4k 8k DËi: 8k e ̈vL ̈v: U = 1 2 kx2  U2 U1 = k2 k1      x2 x1 2  2 = k2 k1        1 2 x1 x1 2  k2 = 8k1 = 8k 24. GKwU e ̄` f‚wg †_‡K 10 m D”PZvq Av‡Q| Dci †_‡K e ̄`wU‡K webv evavq co‡Z w`‡j f‚wg †_‡K 8 m D”PZvq e ̄`wUi MwZkw3 I w ̄’wZkw3i AbycvZ n‡eÑ 1 : 4 4 : 1 5 : 4 4 : 5 DËi: 1 : 4 e ̈vL ̈v: Ek Ep = mg(H–x) mgx  10 – 8 8  1 4  Ek : Ep = 1 : 4 25. m f‡ii †Kv‡bv e ̄`i MwZkw3 Ek n‡j Gi fi‡eM n‡eÑ 1 2 mEk 2mEk 2mEk m 2Ek DËi: 2mEk e ̈vL ̈v: Ek  p 2 2m  p 2  2Ekm  p  2mEk 26. wb‡Pi †KvbwU ÿgZvi GKK bq? Ak¦ÿgZv Ryj/†m‡KÛ IqvU Ryj
4 DËi: Ryj e ̈vL ̈v: kw3i GKK Ryj| 27. Nl©Y ej I e ̄`i †e‡Mi ga ̈Kvi †KvY KZ?   2  4 0 DËi:  e ̈vL ̈v: Nl©Y ej me©`v MwZi wecix‡Z KvR K‡i| 28. AmsiÿYkxj e‡ji ˆewkó ̈ †KvbwU? K...ZKvR k~b ̈ c‡_i Ici wbf©i K‡i bv hvwš¿K kw3i wbZ ̈Zvi m~Î Lv‡U bv K...Z KvR cybiæ×vi m¤¢e DËi: hvwš¿K kw3i wbZ ̈Zvi m~Î Lv‡U bv 29. GKwU B‡Ui ˆ`N© ̈ 0.48 m, cÖ ̄’ 0.24 m Ges D”PZv 0.12m| Gi fi 2.5 kg| B‡Ui ˆ`N© ̈‡K Abyf~wgK Ae ̄’vb n‡Z Dj¤^ Ae ̄’v‡b ivL‡Z Kx cwigvY KvR Ki‡Z n‡e? 5.88 J 4.41 J 3.456 J 1.764 J DËi: 4.41 J e ̈vL ̈v: fi‡K‡›`ai miY W  mg     0.48 2 – 0.12 2  2.5 × 9.8 × (0.24 – 0.06)  4.41 J 30. †Kvb Z_ ̈wU MwZkw3i (Kinetic Energy) Rb ̈ cÖ‡hvR ̈ bq? e ̄`i †eM bv _vK‡j, MwZkw3 _v‡K bv MwZkw3 e ̄`i AYy cigvYyi Av‡cwÿK Ae ̄’v‡bi Dci wbf©i K‡i †Kvb e ̄` MwZkxj nIqvi Rb ̈ kw3 AR©b K‡i m f‡ii e ̄`i †eM v n‡j, e ̄`i MwZkw3 mv 2 DËi: MwZkw3 e ̄`i AYy cigvYyi Av‡cwÿK Ae ̄’v‡bi Dci wbf©i K‡i imvqb (Chemistry) 31. p-eøK †gŠ‡ji msL ̈v KqwU? 14 27 36 41 DËi: 36 e ̈vL ̈v: s-eøK †gŠj 14wU ; d-eøK †gŠj 41wU ; p-eøK †gŠj 36wU, f-eøK 27wU 32. f-eøK †gŠj ̧‡jv‡K Kx ejv nq? gy`av avZz Ae ̄’všÍi avZz g„rÿvi avZz AvšÍtAe ̄’všÍi †gŠj DËi: AvšÍtAe ̄’všÍi †gŠj e ̈vL ̈v: gy`av avZz: (n – 1)d10 4s1–2 †hgb- Cu, Ag, Au Ae ̄’všÍi avZz: (n – 1)d1–9 ns1–2 †hgb- Ti, V, Cr, Fe, Ni BZ ̈vw` g„rÿvi avZz: ns2 †hgb- Be, Mg, Ca, Sr, Ba AvšÍtAe ̄’všÍi †gŠj: (n – 2) f1–13 †hgb- U, Pa, Nd BZ ̈vw` 33. wb‡Pi †KvbwU g„rÿvi †gŠj? Ca Na Si P DËi: Ca e ̈vL ̈v: MÖæc-2 Gi †gŠjmg~n‡K g„rÿvi avZz ejv nq| Ca(20)  1s2 2s2 2p6 3s2 3p6 4s2 ; MÖæc-2 myZivs, K ̈vjwmqvg (Ca) GKwU g„rÿvi †gŠj| 34. wb‡Pi †Kvb †gŠjwU e ̈wZμgx B‡jKUab web ̈vm †`Lvq? Zn Fe Cu Pb DËi: Cu e ̈vL ̈v: Cu(29) = 1s2 2s2 2p6 3s2 3p6 3d10 4s1 c~Y© d AiweUvj (3d10) AwaK w ̄’wZkxj nIqvq 4s AiweUvj n‡Z 1wU B‡jKUab 3d AiweUv‡j cÖ‡ek K‡i| 35. wb‡Pi †Kvb †hŠ‡Mi ÿvixq g~j‡Ki d-AiweUv‡j B‡jKUab Av‡Q? ScCl3 TiCl4 CrSO4 CaSO4 DËi: CrSO4 e ̈vL ̈v: †hŠM ̧‡jvi K ̈vUvqb ev ÿvixq g~jK h_vμ‡gÑ Sc3+, Ti4+, Cr2+, Ca2+ 24Cr2+  [Ar] 3d4 21Sc3+  [Ar] 4s0 3d0 22Ti4+  [Ar] 4s0 3d0 20Ca2+  [Ar] 4s0 3d0 36. P ̈vj‡Kv‡Rb MÖæc †KvbwU? 16 15 14 11 DËi: 16 e ̈vL ̈v: †cv‡jvwbqvg (Po) I wjfvi‡gvwiqvg (Lv) G `ywU †gŠj e ̈ZxZ ch©vq mviwY‡Z 16 MÖæ‡ci Ab ̈me †gŠj- Aw•‡Rb (O), mvjdvi (S), †m‡jwbqvg (Se), †Ujywiqvg (Te) G PviwU †gŠj‡K GKwÎZfv‡e P ̈vj‡Kv‡Rb e‡j| 37. AvKv‡ii †ÿ‡Î †KvbwU mwVK? Be < B Mg < Al F > Ne Mg > Na DËi: F > Ne e ̈vL ̈v: AvKv‡ii ch©vqwfwËK m¤úK©: GKB ch©v‡qi evg †_‡K Wv‡b †M‡j AvKvi K‡g| AvKv‡ii MÖæcwfwËK m¤úK©: GKB MÖæ‡ci Dci †_‡K wb‡P †M‡j AvKvi ev‡o| F I Ne GKB ch©v‡qi evg †_‡K Wv‡b nIqvq AvKv‡ii μg: F > Ne 38. X(g)  X + (g) + e– ; wewμqvwU msNU‡b wb‡Pi †KvbwU cÖ‡qvRb? AvqwbKiY kw3 ̄^-cÖfveK B‡jKUab kw3 Zwor FYvZ¥KZv DËi: AvqwbKiY kw3