Multiple Choice Question on Basic Concept of Science Class IX Standard Practice Test 5

By Global Rail Network on January 27, 2015

This is a mock drill question bank on Basic Concept of Science of Class IX standard for those appearing in different competitive examinations. The question bank consists of 24 questions with clock set for 20 minutes. After you finish the test, press Quiz Finish and you will get the answer sheet, your result and its comparison with others. You will also be given remarks containing the explanation about the answer and also about the distracters (other options) to build confidence on the subject. Always remember that the Mock Drill is to understand how your brain works in handling different pressure and the way distracters are constructed.

Sr No	Question	Answer	Remarks
2	Nutrient-poor soils can be planted with which plant to enrich them with nitrogen?	legume	Processing, or fixation, is necessary to convert gaseous nitrogen into forms usable by living organisms. Some fixation occurs in lightning strikes, but most fixation is done by free-living or symbiotic bacteria. These bacteria have the nitrogenase enzyme that combines gaseous nitrogen with hydrogen to produce ammonia, which is then further converted by the bacteria to make its own organic compounds. Some nitrogen fixing bacteria, such as Rhizobium, live in the root nodules of legumes (such as peas or beans). Here they form a mutualistic relationship with the plant, producing ammonia in exchange for carbohydrates. Nutrient-poor soils can be planted with legumes to enrich them with nitrogen. A few other plants can form such symbioses. Nowadays, a very considerable portion of nitrogen is fixated in ammonia chemical plants.
3	Find the distance travelled by a train starting from rest in 50 sec of which acceleration for first 30 sec is 1.12 Km/hour/sec and next 20 sec by 0.9 km/hour/sec.	190 m	Convert acceleration SI units i.e. 1.12 Km/hour/sec = 1.121000/3600 m/sec/sec or 0.311 and 0.91000/3600=0.25 m/sec/sec. S=1/2[0.3113030+0.252020]or 1/2[279.9+100] = 190 m
4	The fixed end of the spring balance is fixed on the wall and another end connected to another spring balance which is pulled with a force of 50 N. The deflection on each spring will be	25, 25	The force exerted on each of the spring is equal and opposite to each other called action and reaction force in compliance to Newton’s third law of motion.
5	Two bricks namely A and B are placed in water at a depth of 2 m and 5 m respectively. Which brick will require more downward force to hold the brick in position?	Both same	The buoyant force will be same for both the bricks which is the difference between the top and bottom pressure, and therefore, the buoyant force acting on the body to be applied to keep the brick in position is same.
6	What happens to speed of sound when it changes its media from air to water?	increases	The speed of sound increases because it travels due to transfer of energy from molecule to another. In water, the molecules are closely held.
7	The audible range of sound for human beings is between	20 Hz-2000 Hz	The hearing range of normal human being is 20 Hz to 2000 Hz. Children of age 5 years can hear sound up to 25 KHz.
8	Ozone depletion in the outer atmosphere will result in	passage of ultra violet rays of the sun to earth
9	Dry ice is	solid carbon dioxide	Carbon dioxide stored at very high pressure in solid state which gets converted directly to gaseous state on decrease of pressure to 1 atm.
10	The method used for the separation of common salt from Ammonium Chloride is	sublimation	Ammonium chloride evaporate on heating, and thus mixture is heated with ammonium chloride is collected as gas. Solubility will not work as both dissolves in water.
11	What is the chemical formula of Aluminium Chloride	AlCl3	The valance of Al is three and that of Chloride is one ; and therefore the formula of AlCl3
12	How the mass number which is an integer represents the mass number of chlorine which is taken as 35.5?	due to existence of isotopes in the ratio of 1:3	Chlorine exists freely with isotopes of 35 and 37 mass number in the ratio of 1:3; and thus average mass number is 35.5 when a sample is taken.
13	The cells organism which lack a nuclear membrane are called	prokaryotes	In some organisms such as bacteria, the nuclear region is poorly defined due to absence of nuclear membrane and are called prokaryotes. The cells having a nuclear membrane are called eukaryotes.
14	Which of the following is not a green house gas?	Ammonia
15	A stone is thrown vertically upward with a velocity of 5 m/sec. How much distance it will travel if the value of g is 10 m/sec/sec?	1.25	h=vv/(2g)=25/210=1.25 m
16	An object weighing m kg moving with a velocity of v on application of force N Newton, the momentum of the object will be	mv	Multiplication of mass with the velocity is called the momentum of the object. The application of force will result in change of its velocity and change of momentum
17	A person is walking on a frozen lake and suddenly hears cracking sound of the ice. What is the same best same option for the person?	to lie flat on the ice and crawl towards the bank	The most important requirement is to reduce the pressure on the frozen ice to prevent further cracking of the ice. By lying down, the pressure or force at a point reduces thus preventing a chance to reduce chance of further propagation of cracking. The effective pressure on the ice is minimized through option 4.
18	What happens to the speed of sound with increasing temperature?	increases	With increasing temperature, the molecules of air get agitated and having less inertia resulting transfer of sound signal from one molecule to another easy.
19	Ultrasound are not used for the following application	remote control	The other application of ultrasound waves is in medical application such as echo-cardiograph and getting images of internal organs of human beings and measurement of distance, direction and speed of under water objects.
20	What is responsible for the depletion of ozone layer	CFC compounds	CFC escapes to the higher environment and reacts with ozone
21	What happens to the size of the air bubble rising from bottom of the pool towards top of the pool?	size increases	The external pressure reduces as the bubble goes up, therefore internal pressure results in increasing the size of the bubble
22	How the intensity of sound varies when the distance between the source and ear is doubled?	becomes one fourth	The intensity of sound varies with distance as I=P/4πr²
23	The vibrations of sound wave are amplified by three bones of which two are called hammer and anvil. Name the third one	stirrup
24	Three containers are filled with water up to same height with same base area but reducing volumetric capacity. Which container will exert maximum force at the base?	All Same	The force at the bottom depends on the height of water column and not the volume of the water I.e. ρgh

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