हमारा पर्यावरण - L2 | खाद्य श्रृंखला | खाद्य जाल | Chapter 2 | कक्षा 10 NCERT विज्ञान | Pooja Ma'am

The pie-chart provided below gives the distribution of land (in a village) under various food crops. Study the pie-chart carefully and answer the questions. नीचे दिए गए वृत्तारेखा में विभिन खाद्य फसलों के ( एक गाँव में ) भूमि का वितरण दिखाया गया हैं। वृत्तारेखा का अध्ययन कीजिए और प्रश्नों के उत्तर दीजिए। If 10% of the land reserved for rice be distributed to wheat and barley in the ratio 2 : 1, then the angle corresponding to wheat in the new pie-chart will be यदि 10% चावल के लिए, संरक्षित भूमि गेहूँ और जौ के बीच 2: 1 में बांट दी जाए, तब गेहूँ के अंतर्गत नया कोण होगा-

If L = 39.5 , Delta_(1) = 6 , Delta_(2) = 9 and c = 10 , then find the mode of the data .

A short bar magnet has a length 2l and a magnetic moment 10 Am^(2) . Find the magnetic field at a distance of z = 0.1m from its centre on the axial line. Here , l is negligible as comppared to z

In a single state transistor amplifier, when the signal changes by 0.02 V the base current by 10 mu A and collector current by 1 mA . If collector load R_(C) = 2k Omega and R_(L) = 10 k Omega , Calculate : (i) Current Gain (ii) Input Impedance, (iii) Effective AC load, (iv) Voltage gain and (v) Power gain.

A small coil C with N = 200 turns is mounted on one end of a balance beam and introduced between the poles of an electromagnet as shown in Fig. The cross sectinal area of the coil is S = 1.0 cm^(2) , the length of the arm OA of the balance beam is l = 30 cm . When there is no current in the coil the balance is irl equilibrium. On passing a current I = 22 mA through the coil the equiibrium is restroed by putting the additional counterweight of mass Delta m = 60 mg ont he balnace pan. Find the magnetic induction at the spot where the coil is located.

A small coil C with N=200 turns is mounted on one end of a balance beam and introduced between the poles of an electromagnetic as shown in Fig. The area of the coils is S=1cm^2 , the length of the right arm of the balance beam is l=30cm. When there is no current in the coil the balance is in equilibrium. On passing is a currentI=22mA through the coil, equilibrium is restored by putting an additional weight of mass m=60mg on the balance pan. Find the magnetic induction field (in terms of x 10^-1T ) between the poles of the electromagnetic assuming it to be uniform.