# 25. while doing an experiment to verify the laws of reflection of sound , in which of the following cases will the sound heard be maximum ?a. Pipes can either be hollow or solid b. When one of the pipes is hollow and the other is solid c. When both the pipes are solid d. When both the pipes are hollow 26. A student observed the slide of life cycle of a mosquito . the stage prior to the one given will be :a.adult mosquito egg pupa larva27. you are given a sphere of radius 2 cm. If you are asked to select a best suited spring balance to determine its weight , then out of the following which one would you prefer / (the sphere is made of an alloy of density 73103kg m23.) I. Range 0 – 1000 gwt , least count 5 gwt II. Range 0 – 500 gwt , least count 2.5 gwt III. Range 0 – 250 gwt , least count 2.5 gwt IV. Range 0 – 100 gwt , least count 1 gwt28. In an experiment a solid was immersed fully in water and it was observed that the solid has suffered an apparent loss in its weight . This apparent loss in weight of the solid must be equal to the : I. Weight of the solid in water II. Weight of the solid in air III. Weight of water displaced by the solid IV. Weight of water filled in the vessel 29. If two objects , when immersed in a fluid , have equal up thrust on them , then :a. Both objects must have equal weights b. Both objects must have equal volumesc. Both objects must have equal densitiesd. Both objects must have equal mass30. Reema took a measuring cylinder and filled it with 52ml.of water .She then immersed an object fully in it and noted the water level in the measuring cylinder as 62ml. She found that object appeared lighter when placed in water . the weight loss felt by her is : 10 gwt 52 gwt 62 gwt 104 gwt31. rinki calculated the pressure exerted by a rectangular block on sand but she forgot the SI units of pressure . The correct units are – Nm Nm-1 Nm2 Nm-2 32. The spring balanced used to find the weight of iron block has 20 divisions between the two consecutive readings i.e. 1kg and 2kg. The spring on hanging the weight is stretched to the 4th division between 4 and 5 on the scale . The weight of the block is :4.4kg 4.8kg 4.2kg data insufficient 33. the frequency of a vibrating string depends upon :a. Length of the string b. Tension in the stringc. Mass per unit length of the string d. All of these34. for producing a transverse wave along a slinky ,a. The free end is jerked at right angle to its lengthb. The free end is compressed c. The free end is pulled d. None of these35. out of the following , the organisms having a spiral shaped chloroplast is : Mushroom spirogyra funeria penicilium36. shyam has observed following parts in the given slide :Pyrenoids ribbon like chloroplast filamentous structure37. The animal whose blood is not the carrier of oxygen to the tissues is : Toad frog man cockroach38. cockroaches are able to detect odour with the help of : Eyes nostrils antennae spiracles 39. while doing an experiment to verify the law of conservation of mass, in a chemical reaction following reaction was performed by yuvraj : Bacl2(aq)+Na2so4(aq) BaSo4 g+2NaCl(aq) 208.5g 142g ‘x’g 117gThe correct observation is :a. 58.5g of BaSo4 in the form of gas is formed b. 233.5g white ppt of BaSo4 is formedc. 233.5g of black precipitate of BaSo4 is formed d. 133.5g of clear solution of BaSo4 is formed40. while verifying the law of conservation of mass in a chemical reaction using a precipitation reaction , sachin carried out the following procedure : I. Determined the mass of white precipitate formed after mixing both the solutions II. Mixed both solutions in a third beaker , using a glass stirrer . III. Determined the mass of both solutions separately . IV. Dissolved the required quantities of BaCl2 andNa2So4 in distilled water The wrong step in the procedure is :a) Step (1)b) Step (2)c) Step (3)d) Step (4)41. four students A,B,C,and D are observing the seeds and flowers of gram plant . They reported their observations that the gram plant has :A. Dicotyledonous seeds and timorous flowersB. Dicotyledonous seeds and pentamerous flowersC. monocotyledonous seeds and timorous flowersD. monocotyledonous seeds and pentamerous flowersthe student whose report is correct is : A B C D42. four students A,B,C,and D are observing the feeding habits of all the developmental stages in the life cycle of mosquito . Their observation that the stage in which it feeds on animal blood is :Pupa egg larva adultThe correct observation is of student : A B C D

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