The outermost covering of animal cell is
A) cell wall
B) plasma membrane
C) nuclear membrane
D) nucleolar envelop
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300 men can construct a200m long wall in 12 days working 8 hours a day. In how many days can 120 men construct 180 m long wall working 9 hours per day
\(\frac{M_1D_1H_1}{W_1}=\frac{M_2D_2H_2}{W_2}\) M1 = 300, D1 = 12, H1 = 8, W1 = 200 M2 = 120, D2 = ? H2 = 9, W2 = 180 \(\frac{300\times12\times8}{200}=\frac{120\times D\times7}{180}\) D = 24 days
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A 13-m long ladder is leaning against a wall. The bottom of the ladder is pulled along the ground, away from the wall, at the rate of 2 m/s. How fast
Correct Answer - `(5)/(6) m//s`
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Distinguish between an adiabatic wall and diathermic wall.
Adiabatic wall Diathermic wall i. An ideal wall or partition separating two systems such that no heat exchange can take place between the systems is called adiabatic wall. A wall that allows exchange of...
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Covering or protecting tissue inside or outside of animal body is
A) Epithelial tissue
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A man shouts loudly close to a high wall. He hears an echo. If the man is at 40 m from the wall, how long after the shout will the echo be heard?
Given: s = 40m, v = 330 m/s To Find: time (t) Formula: Time = distance \(\frac{distance}{speed}\) Calculation: The distance travelled by the sound wave = 2 × distance from man to wall. = 2 × 40...
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A heavy truck and bicycle hit a wall, with same velocity. More damage to the wall expected from
A) heavy truck
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If 36 men can built a wall in 12 days, then 16 men can built the same wall in …………….. days.
Correct option is (A) 27 Given that 36 men can built a wall in 12 days. \(\therefore\) Total work = 36 \(\times\) 12 Let 16 men can built the wall in x days. \(\therefore\) Total work = 16 \(\times\) x \(\because\) Both work...
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If 36 men can built a wall in 12 days, then 16 men can built the same wall in …………….. days.
2 Answers
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30 labourers can built a wall in 9 days. If the same wall is to be built by 20 labourers how many days they will take to complete it?
Correct option is (B) 13 1/2 Work done to complete the wall = Work done by 30 labourers in 9 days = Work done by 20 labourers in x days \(\therefore 20\times x=30\times9\) \(\Rightarrow x=\frac{30\times9}{20}=\frac{27}2\,days\) \(=13\frac12\,days\)
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