(a) the work done by the pump,
(b) the power at which the pump works, and
(c) the power rating of the pump if its efficiency is $40%$ . (Take $g = 10 m s^{- 2}$ )
$[$ Hint : Efficiency $= \frac{useful power}{nower innut}]$

Topic:

Work and Energy

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Question 11

Megasporangia is present in all except: (1) cycas (2) pinus (3) pteris (4) Salvinia

Topic:

The Fundamental Unit of Life

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Question 12

Free living gametophyte present in all except (1) Selaginella (2) Porphyra (3) Marchantia (4) Fucus

Topic:

Diversity in Living Organisms

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Question 13

MATHEMATICS WORKSHEET - 16 GNMS Time and Distance gave the following : Sate: 1. The distance between two cities

A

and

B

425 km

. If a car leaves

A

2 p . m

. and reaches

B

10.30 p . m

., what is the speed of the car? 2. A car travels

60 km

in 45 minutes. Find its speed in

km / h

? 3. A train travels a distance of

540 km

in 9 hours. How much time will this train take to travel

330 km

? In 8 minutes, Rajan jogs 800 metres. What is his speed in

km / h

? At 7 a.m., Lalit starts his journey from Delhi on his motorcycle to Ambala, 285 kilometres away. He drives at a speed of

30 km / h

. At what time will he reach his destination?

Topic:

Number Systems

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Question 14

how do I know if I have to add or subtract in a simultaneous equation

Topic:

Polynomial & Linear Equations

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Question 15

4√28÷3√7÷∛7

Topic:

Mathematics

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Question 16

24. एंक स्वरित्र की आवृत्ति

(n)

, उसकी भुजा की लम्बाई

(l)

, उसके पदार्थ के घनत्व

(d)

तथा यंग प्रत्यास्थता गुणांक

(Y)

पर निर्भर

Topic:

Current & Magnetic Effects

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Question 17

Simplify: .

Topic:

Algebra 2

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Question 18

\to 2 PbO (s) + 4 NO_{2} (g) + O_{2} (g) \to 2 NO (g) I (aq) \to ClO_{(aq)} + Cl^{(aq)} + 4 H_{2} O (ℓ) (aq) + 3 H_{2} O (l) \to PH_{2} (g) + 3 H_{2} PO_{2}^{-} (aq)

Ans. (2) 63. Match List-I with List-II : n enthalpies of element

X

and

Y

are and

590 kJ mol^{- 1}

, respectively and on enthalpies of

X

and

Y

are 3069

145 kJ mol^{- 1}

, respectively. statement is :- metal and

Y

is an alkaline earth aline earth metal and

Y

is an alkali

Y

are alkali metals.

Y

are alkaline earth metals. Choose the correct answer from the options given below :

(a) - (iv), (b) - (ii), (c) - (iii), (d) - (i)
(a) - (ii), (b) - (iv), (c) - (iii), (d) - (i)
(a) - (iii), (b) - (i), (c) - (iv), (d) - (ii)
(a) - (i), (b) - (iii), (c) - (iv), (d) - (ii)

Topic:

Electrochemistry

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Question 19

BA

crystallizes in

CsCl

type structure and

KCl

NaCl

type structure. Edge-length of unit cell of

KCl

is twice that of

BA

and molecular weight of

BA

is twice that of

KCl

. Calculate ratio of density of

BA

to that of

KCl

Topic:

Solid State

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Question 20

PERSEVERE You roll 3 dice. What is the probability that the outcome of at least two of the dice will be less than or equal to 4 ? Explain your reasoning.

Topic:

Mathematics

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