7th Test Solutions – CONCEPT ACADEMY

Classes NEET-JEE, CUET & XI Physics
PAPER CODE BP0306

Topic Covered:- Physics Chapter 7:- Alternating Current

Power factor of an ac circuit is a measure of:

(a) virtual power

(b) power lost in the circuit

(d) all the above

The dimensional formula of L/R is similar to that of:

(a) frequency

(b) time

(d) none of these

An acceptor circuit is :

(a) series resonant circuit

(b) parallel resonant circuit

(d) None of these

Transformer works on the principle of:

(a) convertor

(b) invertor

(d) self-induction

Which of the following effects is not shown in alternating current ?

(a) Chemical effect

(b) Magnetic effect

(d) All of these

Faraday constant:

(a) depends on the amount of the electrolyte

(b) depends on the current in the electrolyte

(d) depends on the amount of charge passed through the electrolyte

The no. of turns in the primary coil of a transformer is 200 and the no. of turns in the secondary is 10. If 240 V a.c. is applied to primary, the output from the secondary

(a) 6 V

(b) 12 V

(d) 48 V

For given circuit the power factor is :

1/√2

None of these

In pure inductive circuit current

(a) lags behind emf by π/2

(b) leads the emf by π/2

(d) leads the emf by π

An electric circuit containing capacitor only suffers:

(a) equal resistance for A.C. and D.C.

(b) Resistance of A.C. > Resistance of D.C.

(d) offers infinite resistance for D.C.

An inductive circuit contains resistance of 10 ohms and an inductance of 20 H. If an A.C. voltage of 120 volt and frequency 60 Hz is applied to this circuit, the current would be nearly

0.016 amp.

0.16 amp.

0.48 amp.

0.80 amp.

An AC circuit draws 5A at 160 V and the power consumption is 600 W. Then the power factor is:-

0.75

0.50

Zero

If V=100sin⁡〖100t 〗Volt and I=100sin⁡〖100t+π/6 〗 Ampere. then find the watt less power in watt :-

104

103

102

2.5 × 103

If an A.C. main supply is given to be 220 V. What would be the average e.m.f. during a positive half cycle

198 V

386 V

256 V

None of these

In series resonant circuit:

(a) reactance is zero

(b) current is zero

(d) None of these

A broadcast circute broadcasts at 300 m band. A condenser of capacitance 2.4 lµF is available. The value of the inductance required for resonant circuit is:

(a) 10-4 H

(b) 10-8 H

(d) 10-2 H

What is the ratio of inductive and capacitance reactances in an ac circuit?

(a) 1

(b) ω²L

(d) l

The dimensional formula of impedance is;

(a) [ML2T-2A-2]

(b) [ML2T-3A-2]

(d) [ML2T-2A-3]

Energy dissipates in LCR circuit in :

(a) L only

(b) C only

(d) All of the above

An iron core transformer with a turns ratio of 8 : 1 has 120 V applied across the primary. The voltage across the

(a) 15 V

(b) 120 V

(d) 960 V

Classes NEET-JEE, CUET & XI Physics
PAPER CODE AP0306

Topic Covered:- Physics Chapter 7:- Work, Energy & Power

Topic Covered:-

Physics Chapter 7:- Work, Energy & Power

A body of mass 10 kg is travelling with uniform speed of 5 m/s. Its kinetic energy is

(a) 25 J

(b) 125 J

(d) 1000 J

2. Find the potential energy stored in a ball of mass 5 kg placed at a height of 3 m above the ground.

(a) 121.20 J

(b) 147.15 J

(d) 182.21 J

3. A ball is dropped from a height of 1 m. If the coeffcient of restitution between the surface and ball is 0.6, the ball rebounds to a height of

(a) 0.6 m

(b) 0.4 m

(d) 0.36 m

4. A body of mass 100 kg falls from a height of 10 m. Its increase in kinetic energy is

(a) 9800 J

(b) 1000 J

(d) 3000 J

5. The rate of doing work is called

(a) Force

(b) Acceleration

(d) Displacement

6. A marble moving with some velocity collides perfectly elastically head-on with another marble at rest having mass 1.5 times the mass of the colliding marble. The percentage of kinetic energy by the colliding marble after the collision is

(a) 4

(b) 25

(d) 67

7. Which is the type of collision in which both the linear momentum and the kinetic energy of the system remain conserved?

(a) Inelastic Collision

(b) Elastic Collision

(d) None of the options

8. The energy possessed by the body by virtue of its motion is known as?

(a) Chemical energy

(b) Thermal energy

(d) Kinetic energy

9. A ball moves in a frictionless inclined table without slipping. The work done by the table surface on the ball is

(a) Negative

(b) Zero

(d) None of the options

10. A man of 60 kg weight is standing at rest on a platform. He jumps up vertically a distance of 1 m and the platform at the same instant moves horizontally forward with the result that the man lands 1 meter behind the point on the platfrom from where the took the jump the total work done by the man at the instant he lands is

(a) 300 J

(b) 150 J

(d) zero

11. Two masses 1 g and 4 g are moving with equal kinetic energies. The ratio of the magnitudes of their linear momenta is

(a) 4 : 1

(b) 1 : 2

(d) 1 : 6

12. A body of mass 10 kg is initially at a height of 20 m above the ground. It falls to a height of 5 m above the ground. Its potential energy in the new position is

(a) 490 J

(b) 50 J

(d) 300 J

13. A body of mass 10 kg moving at a height of 2 m, with uniform speed of 2 m/s. Its total energy is

(a) 316 J

(b) 216 J

(d) 392 J

14. A solid cylinder of length 1 m and diameter of cross section y 100 cms is first placed with its axis vertical its then slowly inclined till its axis is horizontal. The loss in its potential energy if the mass of the cylinder is 10 kg is

(a) 5g J

(b) 10g J

(d) g J

15. When the linear momentum of a particle is increased by 1% its kinetic energy increases by x%. When the kinetic energy of the particle is increased by 300%, its linear momentum increases by y%. The ratio of y to x is

(a) 300

(b) 150

(d) 50

16. A quantity of work of 1000 J is done in 2 seconds. The power utilised is

(a) 998 W

(b) 1002 W

(d) 500 W

17. A man of 60 kg weight is standing at rest on a platform. He jumps up vertically a distance of 1 m and the platform at the same instant moves horizontally forward with the result that the man lands 1 meter behind the point on the platfrom from where the took the jump the total work done by the man at the instant he lands is

(a) 300 J

(b) 150 J

(d) zero

18. A body of mass 20 kg is initially at a height of 3 m above the ground . It is lifted to a height of 2 m from that position. Its increase in potential energy is

(a) 100 J

(b) 392 J

(d) -100 J

19. Which one has higher kinetic energy? Both light and heavy bodies have equal momenta.

(a) Heavy body

(b) Light body

(d) None of the options

20. An electric heater of rating 1000 W is used for 5 hrs per day for 20 days. What is the electrical energy utilized?

(a) 100 kWh

(b) 200 kWh

(d) 500 kWh

Class X Chemistry PAPER CODE DS0207

Subject –Science X Topic Covered:-Science Chapter 3:- Metals & Non Metals

Aluminium is used for making cooking uten¬sils. Which of the following properties of alu¬minium are responsible for the same?
(i) Good thermal conductivity
(ii) Good electrical conductivity
(iii) Ductility
(iv) High melting point
(a) (i) and (ii)
(b) (i) and (iii)
(c) (ii) and (iii)
(d) (i) and (iv)
Which of the following is the correct arrange-ment of the given metals in ascending order of their reactivity?
Zinc, Iron, Magnesium, Sodium
(a) Zinc > Iron > Magnesium > Sodium
(b) Sodium > Magnesium > Iron > Zinc
(c) Sodium > Zinc > Magnesium > Iron
(d) Sodium > Magnesium > Zinc > Iron
Non-metals form covalent chlorides because
(a) they can give electrons to chlorine
(b) they can share electrons with chlorine
(c) they can give electrons to chlorine atoms to form chloride ions
(d) they cannot share electrons with chlorine atoms
Which of the following pairs will give dis-placement reactions?
(a) FeSO₄ solution and Copper metal
(b) AgNO₃ solution and Copper metal
(c) CuSO₄ solution and Silver metal
(d) NaCl solution and Copper metal
The most abundant metal in the earth’s crust is
(a) Iron
(b) Aluminium
(c) Calcium
(d) Sodium
Al₂O₃ + 2NaOH → …… + H₂O
(a) Al(OH)₃
(b) Na₂O
(c) NaAlO₂
(d) AlNaO₂
Which of tire following are not ionic compounds?
(i) KCl
(ii) HCl
(iii) CCl₄
(iv) NaCl
(a) (i) and (ii)
(b) (ii) and (iii)
(c) (iii) and (iv)
(d) (i) and (iii)
The poorest conductor of heat among metals is
(a) Lead
(b) Mercury
(c) Calcium
(d) Sodium
The electronic configuration of three elements X, Y and Z are as follows:
X = 2, 4, Y = 2, 7, Z = 2,1 Which two elements will combine to form an ionic compound and write the correct formula,
(a) X₂Y
(b) YZ
(c) XZ₃(d)Y₂ Z
Example of an amphoteric oxide is:
(a) Na₂O
(b) K₂O
(C) Al₂O₃
(d) MgO
Which one among the following is an acidic oxide?
(a) Na₂O
(b) CO
(c) CO₂
(d) Al₂O₃
The atomic number of an element ‘X’ is 12. Which inert gas is nearest to X?
(a) He
(b) Ar
(c) Ne
(d) Kr
The process in which a carbonate ore is heated strongly in the absence of air to convert it into metal oxide is called
(a) Roasting
(b) Reduction
(c) Calcination
(d) Smelting
Oxides of moderately reactive metals like Zinc, Iron, Nickel, Tin, Copper etc. are reduced by using
(a) Aluminium as reducing agent
(b) Sodium as reducing agent
(c) Carbon as reducing agent
(d) Calcium as reducing agent
Which of the following non-metal is lustrous?
(a) Sulphur
(b) Oxygen
(c) Nitrogen
(d) Iodine
Amalgam is an alloy of
(a) Copper and Tin
(b) Mercury
(c) Lead and Tin
(d) Copper and Zinc
Copper objects lose their shine and form green coating of
(a) Copper oxide
(b) Copper hydroxide and Copper oxide
(c) Basic Copper carbonate
(d) Copper carbonate
The highly reactive metals like Sodium, Potas-sium, Magnesium, etc. are extracted by the
(a) electrolysis of their molten chloride
(b) electrolysis of their molten oxides
(c) reduction by aluminium
(d) reduction by carbon
Which of the following oxide(s) of iron would be obtained on prolonged reaction of iron with steam?
(a) FeO
(b) Fe₂O₃
(c) Fe₃O₄
(d) Fe₂O₃ and Fe₂O₄
Which property of metals is used for making bells and strings of musical instruments like Sitar and Violin?
(a) Sonorousness
(b) Malleability
(c) Ductility
(d) Conductivity

Class IX History PAPER CODE EH0207

History Chapter 3 Nazism & Rise of Hitler

Where is the Wall Street Exchange?
(a) America
(b) Britain
(c) France
(d) Germany
What gave Nazi state its reputation as the most dreaded criminal state?
(a) Extra-constitutional powers were given to the newly organised forces like Gestapo, the SS and SD
(b) People could be detained in Gestapo torture chambers and sent to concentration camps
(c) No legal procedures were there for the arrested people
(d) All the above
Who were the worst sufferers in Nazi Germany?
(a) Jews
(b) Poles
(c) Russians
(d) Gypsies
Which incident persuaded the USA to join the war?
(a) Hitler’s attack on Eastern Europe
(b) Hitler’s policy of genocide of the Jews
(c) Helplessness of England and France
(d) Japan’s attack on the US base at Pearl Harbour
What was Hitler’s ideology of ‘lebensraum’ or living space?
(a) Multi-storeyed buildings should be built in Germany to increase the living space
(b) The world must be occupied enabling the material resources and power of the German nation.
(c) New territories had to be acquired for settlement
(d) Both (b) and (c)
When and among which countries was the Tripartite Pact signed?
(a) 1940, Germany, Italy and Japan
(b) 1939, Germany, Austria and USSR
(c) 1940, England, France and USA
(d) 1938, England, Germany and USSR
What was the slogan coined by Hitler when he followed his aggressive foreign policy?
(a) Messenger from God
(b) Conquer the world
(c) One people, one empire, and one leader
(d) we are Aryans, the real rulers
What was ‘Dawes Plan’?
(a) A plan which imposed more fines on Germany
(b) A plan which withdrew all punishment from Germany
(c) A plan which reworked the terms of reparation to ease financial burden on the Germans
(d) None
War in 1917 led to the strengthening of Allies and the defeat of Germany because of entry of
(a) China
(b) Japan
(c) the USA
(d) Spain
What was the most important result of the Spartacus League uprising in Germany in 1918-19?
(a) The Weimar Republic crushed the rebellion
(b) The Spartacists founded the Communist Party of Germany
(c) The Weimar government accepted the demands of the Spartacus League
(d) Both (a) and (b)
Why did Helmut’s father kill himself in the spring of 1945?
(a) He was depressed by Germany’s defeat in Second World War
(b) He feared that common people would mishandle him and his family
(c) He feared revenge by the Allied Powers
(d) He wanted to die because of the crimes he had committed during Nazi rule
Which of the following bodies was set up to try and prosecute the Nazi war criminals at the end of World War II?
(a) International Military Tribunal
(b) British Military Tribunal
(c) Allied Military Tribunal
(d) Allied Judicial Court
Why did the Nuremburg Tribunal sentence only 11 Nazis to death for such a massive genocide?
(a) Only these 11 Nazis were found guilty
(b) The Allies did not want to be harsh on the defeated Germany as they had been after WorldWar
(c) Germany promised never to repeat such an act(d) Germany was ready to pay a huge compensation to the Allied countries for these killings
What was Hitler’s historic blunder and why?
(a) Attack on Soviet Union in 1941 was a historic blunder by Hitler
(b) He exposed his western front to British aerial bombing
(c) The Soviet Red Army inflicted a crushing and humiliating defeat on Germany atStalingrad
(d) All the above
A bronze cross was given to the woman who produced
(a) two children
(b) four children
(c) six children
(d) eight children
Which of the following statements is false about soldiers in the World War I?
(a) The soldiers, in reality, led miserable lives in trenches, survived with feeding on the copra’s
(b) They faced poisonous gas and enemy shelling and loss of comrades

(c) All soldiers were ready to die for their country’s honour and personal glory
(d) Aggressive propaganda glorified war

17. The Treaty of Versailles (1920) signed at the end of World War I, was harsh and humiliating for Germany, because
(a) Germany lost its overseas colonies, and 13 per cent of its territories
(b) It lost 75% of its iron and 26% of its coal to France, Poland, Denmark and Lithuania, was forced to paycompensation of 6 billion pounds
(c) The western powers demilitarised Germany and they occupied resource-rich Rhineland in the 1920s
(d) All the above

18. The game Hitler glorified was
(a) wresting
(b) kabaddi
(c) hockey
(d) boxing

19. What was the response of the Germans to the new Weimar Republic?
(a) They held the new Weimar Republic responsible for Germany’s defeat and the disgrace at Versailles

(b) The republic carried the burden of war guilt and national humiliation

20. The time span of the First World War was
(a) 1911-1914
(b) 1914-1918
(c) 1918-1921
(d) 1920-1925

21. The Nazi Party had become the largest party by the
(a) 1920
(b) 1925
(c) 1926
(d) 1932

22. Hitler became the Chancellor or Germany in the year
(a) 1931
(b) 1932
(c) 1933
(d) 1934

23. The country that dropped atom bomb on Hiroshima in Japan was
(a) France
(b) America
(c) Germany
(d) Britain

24. Who could enter Jungvolk?
(a) Ten-year-old boys
(b) Twelve-year-old boys
(c) Fourteen-year-old boys
(d) Eighteen-year-old boys

25. Which country was defeated after the First World War?
(a) France
(b) Germany
(c) Russia
(d) Britain